Fix LDAP user filter

This reverts commit e9d4587f, which is
incompatible with GitLab's built in LDAP user filter: a GitLab LDAP
filter is [added on top of the other filters used to find the
user](https://gitlab.com/gitlab-org/gitlab-ce/blob/982d4d51e8110bec280eb00db0fb756b062103d9/lib/gitlab/ldap/adapter.rb#L61)

Example GitLab LDAP filter: `(memberOf=cn=foo,dc=bar)`.

In contrast, an omniauth-ldap filter [replaces the 'normal'
filters](https://gitlab.com/gitlab-org/omniauth-ldap/blob/76d77543dec0c585bb4e974262f43675f9810953/lib/omniauth/strategies/ldap.rb#L55)

Example omniauth-ldap user filter:
`(&(uid=%{username})(memberOf=cn=foo,dc=bar))`.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Dev setup on metal

Cloud com

Deploy key in multiple projects

Add doc on adding a deploy key easily to multiple projects through the API.

Small ui improvements

* fix ugly errors block when admin save invalid user
* fix ugly errors when you tries to save invalid wiki page

Improve Milestome UI

Milestone UI header was different from Issue/MR pages but use same UI elements.
This MR fixes it so UI looks same for issue/mr/milestone

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix install guide

Fix gitlab setup. DB setup must go after gitlab-shell setup. Because in seeds we need `/home/git/repositories` to exist

Rebuild Postgres indexes after a MySQL conversion

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Ubuntu 14 needs recent ruby patch

Ruby version updated so it doesn't have the readline bug https://www.ruby-lang.org/en/news/2014/05/09/ruby-2-0-0-p481-is-released/.

Added Cloud 66 to third party one-click installers

Version 6.9.0.rc1

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Clean up *.log.1 files during 6.6-to-6.7 upgrade

Use example email in documents and example files

Fixes #1177

Add link to ee jenkins

/cc @marin