Avoid using deprecated Q_AGENT_EXTRA_AGENT_OPTS in ML2 setup

Q_AGENT_EXTRA_AGENT_OPTS is deprecated now and stack.sh displays
the warning that it will be removed early in "K" cycle.
Neutron ML2 devstack uses Q_AGENT_EXTRA_AGENT_OPTS to pass tunnel
configurations to Neutron plugin agents.

This commit removes the usage of Q_AGENT_EXTRA_AGENT_OPTS and
configures these config options directly.

Change-Id: I7fc1613ff78c0a8b1e80cc041b06f5d4680c34f2
Closes-Bug: #1354670
Set display name in apache processes

This change makes apache set process group name in the process name,
so when listing the processes the user can easily identify what's
running in each apache process. This is specially useful to debug
memory consumption or when a process consumming too much CPU.

Change-Id: I9787980052f451f452d3b8e5e51385ad5aa01e6a
Add ability to switch database driver

Also added mysqlconnector packages into default installation.

blueprint enable-mysql-connector

Change-Id: Ib2cda7cb183dc8f0ff4759cc6e9ecab469fd121c
Remove code tagged as "can be removed after Icehouse"

Change-Id: Ib78f3d55c9dcd46e0dfc3343c32e077cf530b5f7
Allow cinder types to be created without be file

3rd party ci tests have not whitelisted errors:
"Not Whitelisted Volume type with name * could not be found."

These are creating noise. Instead of requiring a backend file
for each vendor, remove the if statement and just create the
necessary type for each defined back-end.

Change-Id: Ic88efa20eb53864e4f3d22d3306841797dcd118d
enable multiple collector workers

currently, a single worker thread writes received samples into
database. this is fine for most occasions but during message
spikes, it is not enough. this patch increase amount of workers to
half the number of processors (so we can ensure ceilometer maintains
lightweight design)

this will also help validate mulitple worker setup works.

Partial-Bug: #1336755
Change-Id: I33037f2f9ebfda43238e5cd0cff75adbed65d055
Guard for worlddump in case LOGDIR is undefined

If LOGDIR is undefined, we'll end up calling worldump with the `-d` option but
pass in an empty string as the option value. This causes an argument parsing
error inside worlddump.

The proposed fix is to detect if LOGDIR is undefined, and if so, omit the `-d`
argument.

Change-Id: I77968849ebd3e3bebd2e5929b87b60fc1b6541bf
Closes-Bug: 1333321
Rename Marconi to Zaqar

This patch changes all Marconi references to Zaqar.

Change-Id: Iec4aeca54c0f383c995fba564bc59daa550d3747
Implements: blueprint project-rename
Add some known contacts

These were taken from frequent committers for the area.

Change-Id: I3bdcb3e54cfb1a8e3d53748ab39da009b428c593
Merge "Guard for worlddump in case LOGDIR is undefined"
Ironic and baremetal install diskimage-builder with pip

This change installs diskimage-builder with pip instead
of from git, and only if the executable ramdisk-image-create
isn't already installed.

This allows the ironic and baremetal to consume the latest
release of diskimage-builder by default, and gives the option of
defining version constraints for which version to install.

If the dib service is enabled (which it isn't by default) then
diskimage-builder will already be installed from git and will
not be re-installed for ironic and diskimage-builder.

Change-Id: Ic6613a11e2c4fb7a1261b81cdc2cf958515e60cd
Install heat-cfntools and heat-templates repos

These projects contain agents which can be installed on custom
images. Installing these repos will allow a future change to
build a custom image containing these projects. This will allow
gating on any changes in these projects by running heat-slow
on the custom image.
The corresponding devstack-gate change is
https://review.openstack.org/#/c/92055/
Change-Id: I7b1343c094f755f79ddeb1bac3ff4c0daa3fb70c
A service to install diskimage-builder

Enabling service 'dib' will install the following repos:
* diskimage-builder
* tripleo-image-elements
* os-collect-config
* os-refresh-config
* os-apply-config

These repos are already pre-fetched in devstack-gate.

This will facilitate gating on changes in these projects by building
a custom image then running the heat-slow job against that image.

diskimage_builder is pip installed from the current git checkout
if the dib service is enabled. This allows devstack gating on
diskimage-builder changes while also allowing diskimage-builder to
be installed from releases for other scenarios (for example, ironic).

Change-Id: Ia911cdee86f5b2e2ba1557e5aa8bf392b92ef555
Merge "Add ability to switch database driver"
Merge "Allow cinder types to be created without be file"
Merge "Remove code tagged as "can be removed after Icehouse""
Merge "Set display name in apache processes"
Merge "Avoid using deprecated Q_AGENT_EXTRA_AGENT_OPTS in ML2 setup"
Merge "enable multiple collector workers"
Clean up local variable usage - cinder

Change-Id: Iedeafa15def1fa26d4ddcbc5f670129f66e38b9d