[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 JENKINS-18902] Exclude lower bound of range from changes
Noting #1327, #1328, #1315
Reference JENKINS-23840 for #1315
Noting f43a450, a8756c6
Merge pull request #1303 from daniel-beck/JENKINS-18902

[FIXED JENKINS-18902] Exclude lower bound of range from changes
Noting #1303
Typo
Merge pull request #1282 from daniel-beck/SECURITY-133

[FIXED SECURITY-133] Restrict access to SCMTrigger status page
Update changelog.html