convert LDAP authorization plugin configuration to YAML

[vladak]

This is a little brother of #2329, just for the LDAP authorization plugins. I have chosen YAML.

I had to select the members by hand via tha @JsonProperty, otherwise this leads to stack overflow via infinite recursion by calling LdapServer#isWorking() from the Jackson serialization methods.

The integer fields not present in the configuration are deserialized to zero values,

opengrok/plugins/src/main/java/opengrok/auth/plugin/ldap/LdapServer.java

Lines 261 to 266 in 953e10a

	if (this.connectTimeout > 0) {
	env.put(LDAP_CONNECT_TIMEOUT_PARAMETER, Integer.toString(this.connectTimeout));
	}
	if (this.readTimeout > 0) {
	env.put(LDAP_READ_TIMEOUT_PARAMETER, Integer.toString(this.readTimeout));
	}

uses the defaults in such case.

This will also help with the stability of the tests, as I have seen plugins/src/test/java/opengrok/auth/plugin/configuration/ConfigurationTest.java fail in the same way as the indexer configuration (#4441).

[vladak]

https://github.com/oracle/opengrok/wiki/Authorization-plugins#ldap-setup will have to be updated once this is merged in.

[vladak]

Example multi-server configuration:

servers:
  - url: "ldaps://ldap-foo.example.com"
    username: cn=admin,ou=admins,dc=example,dc=com
    password: changeme
  - url: "ldaps://ldap-bar.example.com"
    username: cn=admin,ou=admins,dc=example,dc=com
    password: changeme
interval: 900000
countLimit: 3
connectTimeout: 3000
readTimeout: 3000
searchTimeout: 1000
searchBase: dc=example,dc=com