Updated from global requirements

Change-Id: Ieb3d8ef20f22f68f954864a42e311b90b9bd556a
Import PublishErrorsHandler from oslo.messaging

log_handler graduated and it's in oslo.messaging now.
Remove unnecessary try/import.

Change-Id: I78cdeba0cb90148b6ebd2f23f1aecb5d1f7ceef8
Remove graduated modules from MAINTAINERS list

Also keep modules list organized alphabetically.

Change-Id: Ib643ced4f4cb76c344b4773439ed8f56506833f1
Merge "Remove graduated modules from MAINTAINERS list"
Improve documentation of run_tests.sh script

Fix typos and change a few sentences of run_tests.sh script.
Also insert punctuation marks in several sentences of help message
to keep a pattern.

Change-Id: I554905f619ff3c5300b2e2603f247596816ac945
Merge "Improve documentation of run_tests.sh script"