[FIXED JENKINS-19905] - Removed section from rebuild options, added help.

Signed-off-by: Oleg Nenashev <nenashev@synopsys.com>
[JENKINS-19910] added support for maven metadata plugin
[JENKINS-19843] Provides an extension point for other plugins to support rebuild plugin.
[JENKINS-19910] added support for maven metadata plugin
[JENKINS-19843] Removed setters frpm RebuildParameterPage. Developers set its properties with the constructor.
[JENKINS-19843] Add an instruction to add a dependency to rebuild plugin to pom.xml.
Merge pull request #17 from ikedam/feature/JENKINS-19843_RebuildParameterProvider

[JENKINS-19843] Provides an extension point for other plugins to support rebuild plugin.
Merge pull request #15 from synopsys-arc-oss/rebuild-ui-fix

[FIXED JENKINS-19905] - Removed section from rebuild options, added help...
Merge pull request #16 from hrmohr/JENKINS-19910

[JENKINS-19910] added support for maven metadata plugin
Merge branch 'master' into JENKINS-20596
[maven-release-plugin] prepare release rebuild-1.21
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' into JENKINS-20596