Add some log info for NoValidHost

Currently when a create call fails due to a
misconfiguration on the backend, or a problem
with satisfying the extra-specs from the filter
scheduler, the only thing you get in the logs is
a "No valid host".

This patch just adds a tiny bit more info to give us
a better idea where we're at.

First the exception shouldn't be setup with "reason=""",
so at least add "reason=no weighed hosts found".

Second, add a warning message prior to getting to that
point when we fail to find a host that satisfies the
{extra/qos}-specs that were requested, and include what
was being requested.

Change-Id: I2ce65b973196f673bac455613a6f8626320339ba
Don't leave snapshots on the floor

The current cloning process in the LVM
driver uses a snapshot to do the data
copy in the background.  Trouble here
is that if the creation or activation
of the new volume fails, we don't
cleanup the snapshot we created.

Just move the create_volume and activate
calls down into the try block so the finally
clause can do the cleanup for us.

Change-Id: If0fbab9d9f39102cdc7d287527be22c4a2b35934
Closes-Bug: #1312718
Remove hard coded reference from gettextutils.py

The following commit 4fdcbff96790753a4c1a508600e5d78b2c3b7172
introduced a few hard coded references to
'/home/jsbryant/cinder-dev/gettextutilsSync/' in
cinder/openstack/common/gettextutils.py. This patch will
removed those references.

Change-Id: Ib880863d275ac102c1eb723972d1ebd2eb3405a1
Closes-Bug: #1344072
Merge "Don't leave snapshots on the floor"
Merge "Add some log info for NoValidHost"