xenapi: Extract plugin installation functions

This change extracts the plugin installation functions, and covers the
extracted functions with tests. Use:

    ./test_funtions.sh run_tests

to run the tests.

Change-Id: I1d78d9e8cc4d52ee2df83d07e4c74dda4805f21a
Add support for iso files as glance images

Change-Id: Id1731c1a0a579fab44bb3944d2369b3feecf15d2
Merge "xenapi: Extract plugin installation functions"
Only start zeromq-receiver when we're using zeromq.

Change-Id: Ibd3e6a74f1098e330be0fcbbb83b9188e51202ad
Merge "Add support for iso files as glance images"
Use example settings in horizon repo as local_settings.py

The current horizon_settings.py in devstack is out-of-date and we
tend to forget to update this file. This commit changes devstack
to use the example settings in horizon repo.

Change-Id: I0bb6af21a806a72ed59f31b094dd21da85ca335e
Don't clobber all iSCSI connections during nova cleanup

The existing cleanup_nova() code inadvertently logs out of all iSCSI
connections on the machine because it does not pass the target name
as the -T parameter. This patch changes it to step through the targets
that match the pattern, logging out of each individually, and following
up with a delete op to cleanup the database.

Change-Id: I26c14acbe0e8de18f0e3bf7ad83b37379503e199
Merge "Don't clobber all iSCSI connections during nova cleanup"