Fix Swift config for Ceilometer usage

Ceilometer filter was previously removed from the Swift
configuration to avoid useless Ceilometer logs in the Swift
ones. This was fixed by setting only warning log level for
this Ceilometer part of the pipeline to keep only important
ones.

Change-Id: I8c41355bb98dbf3bb59ec792221b05ea936086b7
Partial-Bug: #1294789
Avoid huge libvirtd.log files on Ubuntu hosts

The libvirt log filter settings match against the filename of
the libvirt source emitting the log message. Normally these
file names are relative to the source tree root, but in the
Ubuntu binary packages these have somehow ended up as absolute
filenames from the OS root. This means that a log filter of
'1:libvirt' which is only intended to match src/libvirt.c
will in fact match every single file. This caused enourmous
log files on Ubuntu hosts running the gate.

The fix is to use '1:libvirt.c' as a more specific filename
match, but we can't do this unconditionally because libvirt
>= 1.2.3 does not use filenames for log filter matching
anymore. So only change the match on Ubuntu hosts for now,
since that's where the original problem lies.

While doing this, also turn off the logging of object ref
and unref operations, since those pollute the logs with lots
of noise.

Change-Id: I71b67507a4e68a7bff0c358857aaaac08ef0c420
Fixed tunnel ranges variable inconsistency.

Change-Id: I7108a3ebd597e1dc808917be9213457df2322100
Generate recent changes list from git log

The list of recent commits to the DevStack repo is now generated
by tools/build_docs.sh from the last 6 month of the git log.

Change-Id: Idefdb5d5188ab7e743af131e3d6cb132382d25d4
Merge "Fixed tunnel ranges variable inconsistency."
Update Apache + mod_wsgi deployment mechanisms

Added a global toggle for enabling HTTPD + mod_wsgi for services
that default deploy to running under Apache. When the variable
``ENABLE_HTTPD_MOD_WSGI_SERVICES`` is set to ``True`` any service
that recommends deploying under HTTPD + mod_wsgi, will be run
under Apache.

If ``ENABLE_HTTPD_MOD_WSGI_SERVICES`` is set to ``False`` the
any service that is defaulted to running under HTTPD + mod_wsgi
will (if capable) be run in an alternate deployment strategy (e.g.
eventlet).

Updated Swift and Keystone to have individual toggles for deploying
under HTTPD + mod_wsgi. This is done to allow for gate to run on
the services under mod_wsgi where appropriate. Toggles are
``KEYSTONE_USE_MOD_WSGI`` and ``SWIFT_USE_MOD_WSGI`` and are both
defaulted to "False" (do not deploy under HTTPD + mod_wsgi).

Change-Id: Id3b121b8f1cde369d184b586e0d875bdbda34813
Merge "Avoid huge libvirtd.log files on Ubuntu hosts"
Merge "Update Apache + mod_wsgi deployment mechanisms"
Enable Keystone under Apache by default

Make the default run mode of Keystone HTTPD + mod_wsgi. This will
enable gating on Keystone under mod_wsgi.

Depends On: https://review.openstack.org/#/c/100764/

Change-Id: I4b664a1d6c9bbb1ff999158f3a8c8ab3bd8d891b
Merge "Generate recent changes list from git log"
Configure rabbitmq credentials in keystone.conf

Rabbitmq credentials in keystone.conf should be updated according
to localrc

This is done mostly to enable keystone notifications.

There are 2 cases where we can use notifications from keystone:
A) Collect audit notifications in ceilometer
B) Collect profiling data

Change-Id: I381d4d670755aa691743caa02df7dc55e05784c2
Add pre-install phase for extras.d plugins

An additional call hook for the extras.d plugins that is called before
any service installation occurs turns out to be needed by Ceph and
useful for other plugins.

This is called between the installation of the system packages listed
as prerequisites and the installation of the actual services.

Change-Id: Id723bdc7542182d2b2eff40c0dc0127307f094c5
Set postgresql max_connections=200

Now that we have multiple workers running by default
in various projects (nova/cinder/glance/trove), the
postgresql job is failing intermittently with connection
failures to the database.

The default max_connections for postgresql is 100 so here
we double that.

Note that the default max_connections for mysql used to
be 100 but is now 151, so this change brings the postgresql
configuration more in line with mysql.

Change-Id: I2fcae8184a82e303103795a7bf57c723e27190c9
Closes-Bug: #1338841
Merge "Enable Keystone under Apache by default"
Merge "Configure rabbitmq credentials in keystone.conf"
Merge "Fix Swift config for Ceilometer usage"
Merge "Add pre-install phase for extras.d plugins"
Add dr-agent service