Give support to custom proxied redirections

+ Give support to custom proxied redirections to provide local HTTP
  servers from Zentyal Remote using /etc/zentyal/remoteservices_redirections.yaml
Remove proxy redirections file if not longer used
Use a more custom way to set proxy redirections
Fixing absolute URLs rewrite rule pattern
Merge branch 'ejhernandez/rs-redirection-conf' into 3.0

Conflicts:
	main/remoteservices/ChangeLog