[JENKINS-21631] - Don't fail with NPE if the PeepholePermalink cache contains the non-numeric value.

Actually, the change just prevents symptoms. There should be an error somewhere else.

Signed-off-by: Oleg Nenashev <o.v.nenashev@gmail.com>
Merge branch 'JENKINS-21631' of github.com:synopsys-arc-oss/jenkins
[FIXED JENKINS-21631] Noting #1275.
Remove NoExternalUse Restrictions on SecurityListener methods.

Plugins like github-oauth-plugin implementing SecurityRealm need to call
these methods in security lifecycle events.
[FIXED JENKINS-23417] Noting merge of #1277.
[JENKINS-22373] Submit on Enter key bug on IE9
Null check the 'properties' element of the json message before attempting to 'rebuild' the 'DescribableList'
[FIXED JENKINS-23094] Use POST to start slave agent
[FIXED SECURITY-133] Restrict access to SCMTrigger status page

The page shows the names and URLs of all jobs currently busy with
polling. This includes jobs users might not regularly be able to
access and might therefore reveal otherwise hidden information.
[FIXED SECURITY-134] Restrict access to admin monitor info page

This could contain sensitive information in the list of solutions
provided. It also shows the path to JENKINS_HOME, exposing OS and
configuration information.
[maven-release-plugin] prepare release jenkins-1.568
[maven-release-plugin] prepare for next development iteration
updated changelog for release
updated changelog as a part of the release
merged back the RC branch
creating an RC branch
the trunk is toward 1.570-SNAPSHOT
Merge pull request #1269 from olivergondza/view-cli

[FIXED JENKINS-23361] Add CLI commands to add jobs to and remove jobs from views
Noting #1269
Merge pull request #1281 from daniel-beck/JENKINS-23094

[FIXED JENKINS-23094] Use POST to start slave agent