To fix the issue: show_techsupport & saidump errors during testbed testing by replacing redis-rdb-tool with rdb-cli

[JunhongMao]

Why I did it

Fix issue: sonic-net/sonic-sairedis#1387
The latest redis-rdb-tools-0.1.15 doesn't support Redis 7.0. Redis 7.0 was released in 2020 and adopted by SONiC's latest version.
So, this issue turned out.
https://github.com/sripathikrishnan/redis-rdb-tools

I.e., the rdb-tools is far behind the Redis 7.0. The librdb can perfectly fix this issue. Please see quote from https://github.com/redis/librdb.

Motivation behind this project
There is a genuine need by the Redis community for a versatile RDB file parser that can export data, perform data analysis, or merely extract raw data from RDB and RESTORE it against a live Redis server. However, available parsers have shortcomings in some aspects such as lack of long-term support, lagging far behind the latest Redis release, and usually not being optimized for memory, performance, or high-traffic streaming for production environments. Additionally, most of them are not written in C, which limits the reuse of Redis components and the potential to contribute back to Redis repo. To address these issues, it is worthwhile to develop a new parser with a modern architecture, that maybe can also challenge the current integrated RDB parser of Redis and even replace it in the future.

So, the below PRS are to replace rdbtools with librdb's tool rdb-cli.
#19268
sonic-net/sonic-sairedis#1391

The above PRs are based on the below PRs.
sonic-net/sonic-sairedis#1288
sonic-net/sonic-sairedis#1298
#16466
sonic-net/sonic-utilities#2972

How I did it

To use the Redis-db SAVE option to save the snapshot of DB each time and recover later, instead of looping through each entry in the table and saving it.

(1) Updated sonic-buildimage repo's platform/broadcom/docker-syncd-brcm-dnx/Dockerfile.j2, 
 install rdb-cli into the syncd containter.
(2) Updated sonic-sairedis repo's script file: files/scripts/saidump.sh, replace rdbtools with rdb-cli.
(3) Updated sonic-sairedis repo's saidump/saidump.cpp, to process the rdb-cli's ouput json file.

How to verify it

Method 1:
On T2 setup with more than 96K routes, execute CLI command -- generate_dump
No error should be shown

Method 2:
Go into syncd0 container.
admin@ixre-egl-board30:~$ docker exec -it syncd0 bash
Run below command, get saidump's sha1sum value.
root@ixre-egl-board30:/# saidump | sha1sum
1893097ecaeae72383432a54bfe4b285d05b23e5 -
Run below command, get saidump.sh's sha1sum value.
root@ixre-egl-board30:/# saidump.sh | sha1sum
1893097ecaeae72383432a54bfe4b285d05b23e5 -
The two sha1sum values should be the same and no error should be shown.
Method 3:
To run the testbed show_techsupport test case.

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305

Tested branch (Please provide the tested image version)

[JunhongMao]

@mlok-nokia @kcudnik, please help to review, thanks.

[JunhongMao]

@qiluo-msft, could you please review and approve this PR? Thanks.

[JunhongMao]

@qiluo-msft, could you please review and approve this PR? Thanks.

[rlhui]

@qiluo-msft reminder to review/approve.

[JunhongMao]

Hello, @qiluo-msft reminder to review/approve.

[JunhongMao]

Hello, @qiluo-msft. Please help to review and approve. It's been a long time since this PR was created.

[JunhongMao]

@qiluo-msft @lguohan. Please help to review and approve. Thanks.

[abdosi]

@saiarcot895

[deepak-singhal0408]

@arlakshm @abdosi could you help with the merge? Thanks,

[abdosi]

@qiluo-msft : can you please merge this

[mlok-nokia]

@lguohan @xumia @qiluo-msft Please help to merge this PR since related PR has been merge already

[anamehra]

Hi @rlhui ,@abdosi , for your viz. This impacts some test cases on 202405 on T2. Thanks

[mssonicbld]

Cherry-pick PR to 202405: #20728

[liushilongbuaa]

@JunhongMao , @qiluo-msft , this PR breaks broadcom build.
Log Link: https://dev.azure.com/mssonic/build/_build/results?buildId=692197&view=results

rax.c: In function 'raxRemove':
rax.c:1064:28: error: pointer 'h' may be used after 'free' [-Werror=use-after-free]
 1064 |             raxNode *new = raxRemoveChild(h,child);
      |                            ^~~~~~~~~~~~~~~~~~~~~~~
In file included from rax.c:45:
rax_malloc.h:44:18: note: call to 'free' here
   44 | #define rax_free free
rax.c:1054:13: note: in expansion of macro 'rax_free'
 1054 |             rax_free(child);
      |             ^~~~~~~~
listpack.c: In function 'lpDeleteRangeWithEntry':
listpack.c:937:31: error: pointer 'lp' used after 'realloc' [-Werror=use-after-free]
  937 |     unsigned long poff = first-lp;
      |                          ~~~~~^~~
In file included from listpack.c:45:
In function 'lpShrinkToFit',
    inlined from 'lpDeleteRangeWithEntry' at listpack.c:945:10:
listpack_malloc.h:47:28: note: call to 'realloc' here
   47 | #define lp_realloc(ptr,sz) realloc(ptr,sz)
      |                            ^~~~~~~~~~~~~~~
listpack.c:177:16: note: in expansion of macro 'lp_realloc'
  177 |         return lp_realloc(lp, size);
      |                ^~~~~~~~~~
cc -MM -fPIC -O3 -std=c99 -Wall -Wextra -pedantic -Werror -fvisibility=hidden zipmap.c > zipmap.d
cc1: all warnings being treated as errors
make[4]: *** [Makefile:15: listpack.o] Error 1

[JunhongMao]

I have created a new PR below to fix it. Please help to review it. Thanks.
#20759