Improve cancel scan and logging of Veracode scanner

[NShani]

Purpose

• In the scanner micro service API, it needs to update the scan manager with the logging details. This can be implemented by a log appender. Requests that are coming to the scanner micro service API should be validated in the scanner layer. These common things should be enforced by the Scanner interface.

Goals

• Persisting scanner logs is a common feature is in all the scanners. So CallbackLogAppender will do the persisting scanner's log in the scan manager. Further this PR improves the scanner interface to do some implementation level enforcement.

Approach

Improve the common scanner classes to enforce the required architecture.

User stories

Release note

Documentation

Training

Certification

Marketing

Automation tests

• Unit tests
• Integration tests

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Samples

Related PRs

Migrations (if applicable)

Test environment

Learning

[codecov]

Codecov Report

Merging #127 into master will decrease coverage by 2.41%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
- Coverage   28.83%   26.42%   -2.42%     
==========================================
  Files          34       36       +2     
  Lines         756      825      +69     
  Branches       28       34       +6     
==========================================
  Hits          218      218              
- Misses        532      601      +69     
  Partials        6        6

Impacted Files	Coverage Δ
...scanmanager/scanners/common/ScannerController.java	0% <0%> (ø)	⬆️
...ols/scanmanager/scanners/common/util/FileUtil.java	0% <0%> (ø)	⬆️
...scanmanager/scanners/common/model/CallbackLog.java	0% <0%> (ø)
...scanmanager/scanners/common/util/CallbackUtil.java	0% <0%> (ø)	⬆️
...r/scanners/common/logging/CallbackLogAppender.java	0% <0%> (ø)

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