Fix regression in Cinder volume type creation

The local-vars cleanup (Iedeafa15def1fa26d4ddcbc5f670129f66e38b9d)
spanned (and missed) this fix (Ib35ffc09f6582354010ac8ca35da581ea508877a)
for volume type creation.

Change-Id: I2b95cbc946727d7708283eca0c07ba1eaddf5db8
Set flavor id for Ironic's baremetal flavor

An existing trove bug prevents it from functioning when Nova flavors exist
with an id that is a UUID instead of an integer, causing Tempest failures.
This sets an integer ID when creating the baremetal flavor for Ironic's use.

Change-Id: Ic090f61a9a47421117dc86b640422f00f468112c
Related-bug: #1333852
Source lib/dstat in unstack.sh

`stop_dstat` function was extracted into $TOP_DIR/lib/dstat in commit
e0b08d04ab41f9aca96997c87bd9fa13feba2536 but the new lib was not sourced in
unstack.sh.

Change-Id: I6878552d9f384fdd7882e52000b37ac6a60844c3
Closes-Bug: 1366713
Run processes without screen

This introduces new run_process() and screen_service() functions and sets the
groundwork to change how DevStack starts services.  screen_service() is simply a
direct call to the screen portion of the old screen_it() function and is intended
to run commands that only need to run under screen, such as log file watchers.

run_process() is a replacement for screen_it() (which remains until all of the
services are updated).  The usage is similar but requires updates to every current
screen_it() call to remove everything that requires the command to be interpreted
by a shell.

The old run_process() and _run_process() functions are still present as
old_run_process() and _old_run_process() to support the deprecated screen_it()
function.  These will all go away in the future once all services have been
confirmed to have been changed over.

There is a similar new set of stop process functions stop_process() and
screen_stop_service().  The old screen_stop() will also remain for the deprecation
period.

As an initial test/demostration this review also includes the changes for
lib/cinder to demonstrate what is required for every service.

I included the scripts I used to test this; tests/fake-service.sh and
tests/run-process.sh are quite rough around the edges and may bite.  They should
mature into productive members of the testing ecosystem someday.

Change-Id: I03322bf0208353ebd267811735c66f13a516637b
Merge "Fix regression in Cinder volume type creation"
Merge "Run processes without screen"
Merge "Set flavor id for Ironic's baremetal flavor"
Merge "Source lib/dstat in unstack.sh"
Merge branch 'master' of https://github.com/openstack-dev/devstack