Fix for MANAGER_URL == '/'
Merge remote-tracking branch 'danyaPostfactum/strrpos' into bug-9282
[#9282] changelog update
[#9282] Fix Minify errors when manager on different subdomain

Merge branch 'bug-9282' into release-2.2

* bug-9282:
  [#9282] changelog update
  Fix for MANAGER_URL == '/'