Do not allow password reset for ldap user.
 Merge branch 'ldap_password' into 'master'

Prevent LDAP users from using reset password function
Added Slack service integration.
Merge pull request #6550 from razielgn/slack-integration

Added Slack service integration.
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Merge pull request #6558 from tsigo/master

Fix travis setup