[Bug 970397] Update ES settings for jenkins
[Fix bug 973618] Cope with removing user who's not a member
[fix bug 973630] Check group aliases for name uniqueness.

Check that GroupBase.name is unique in ALIAS_MODEL.
Merge pull request #821 from glogiotatidis/973630

[fix bug 973630] Check group aliases for name uniqueness.
Merge pull request #822 from caktus/973618-remove-group-members-traceback

[Fix bug 973618] Cope with removing user who's not a member
Merge pull request #825 from Sancus/fix-jenkins-ES

[Bug 970397] Update ES settings for jenkins