Fix missing format specifier in ImagePropertiesFilter log message

Commit a52259e introduced some changes to debug log messages in the
ImagePropertiesFilter but with that came a bug due to a missing format
specifier.

Closes-Bug: #1253875

Change-Id: Ic60b7ba179bd43b80c500be084a1809b6b0b32ca
Bump to sqlalchemy-migrate 0.8.2

This allows us to drop some unsightly
0.7.3 patching and also avoids potential
issues in using 0.8.1 which had a bad
release version string (it was called '0.7.3dev' by mistake).

This will require a requirements change here:

 https://review.openstack.org/56662

Change-Id: I5f80dfc07f8256716d025002fc1a1f47e58b2142
Closes-Bug: 1251700
Remove duplicate BuildAbortException block

Somehow, most likely due to a bad rebase, there were two
BuildAbortException blocks in the same section.  This removes one.

bp remove-cast-to-schedule-run-instance

Change-Id: I29684e222f18e6da280ed181447750525d878423
Merge "Remove duplicate BuildAbortException block"
Merge "Fix missing format specifier in ImagePropertiesFilter log message"
Merge "Bump to sqlalchemy-migrate 0.8.2"
XenAPI: Speedup host_ref cannot change - get it once

The host we run on is fixed - getting this each time from XAPI
is expensive

Change-Id: Ifee9a778f3ed855ef52b001de3fc2ebbd0b972cf
XenAPI: get_info was very expensive

Getting the whole VM record is expensive and slowed down Tempest tests
significantly.

Change-Id: I93bcef5b692a531aac41518dc29d5d4f46cded65
XenAPI: Tidy calls to get_all_ref_and_rec

Use in fewer places, and where it is still used, use the more
efficient get_all_records

Change-Id: I4725c3f1fdebdf1737941cb7db69b19afb22df9f
XenAPI: Speedup get_vhd_parent_uuid

In many cases the VDI record has already been retrieved.
Use it rather than expensively getting a new VDI record from XAPI.

Change-Id: I469e2a415c1f1924010f47d3927ca18c45a7b8f8
XenAPI: Reduce calls to sr_scan

These are expensive and not needed in the scenarios here

Change-Id: I2aeda6e2b7a001ac23ee486495592e242bc078ba
XenAPI: get_XYZ is faster than get_record

Replace multiple calls to use get_XYZ in preference.

Change-Id: I52e20c4f4c9d6a6ad019694916ee057cc96b18a6