[JENKINS-23462] Sectioned views are not evaluated for job priority

Handling differences in implementations of contains() in 
various View/ViewGroups
Corrected comments
Removed unnecessary code.
[JENKINS-23462] Sectioned views are not evaluated for job priority 

 * Need to use getItems() not getItem() to get the items in the View
 * Added test-case for Sectioned View Plugin
[JENKINS-23462] Sectioned views are not evaluated for job priority 

Updated test-case to include job by regex since this was the
the cause of the problem.
[maven-release-plugin] prepare release PrioritySorter-2.8
[maven-release-plugin] prepare for next development iteration
Merge remote-tracking branch 'jenkinsci/master'

Conflicts:
	src/main/java/jenkins/advancedqueue/PriorityConfiguration.java