sort .gitignore for readability

sort .gitignore using sort -V to create something more readable
for future additions, instead of always appending to the end
of the file.

Change-Id: I7e5f0a792b5555a3c53f6da124572e0e3a7d7f9b

.gitignore

@@ -1,33 +1,32 @@
-*.pyc
-*.DS_Store
-local_settings.py
-Authors
-AUTHORS
-ChangeLog
-MANIFEST
-CA/
-keeper
-instances
-keys
-build/*
-build-stamp
-.nova-venv
-.venv
-.tox
-*.sqlite
-*.log
-*.mo
-nosetests.xml
-coverage.xml
-tools/conf/nova.conf*
-cover/*
-nova/tests/cover/*
-nova/vcsversion.py
 .autogenerated
-dist/*
 .coverage
-covhtml
-*.egg*
+.nova-venv
 .project
 .pydevproject
-
+.tox
+.venv
+AUTHORS
+Authors
+CA/
+ChangeLog
+MANIFEST
+build-stamp
+build/*
+coverage.xml
+cover/*
+covhtml
+dist/*
+instances
+keeper
+keys
+local_settings.py
+nosetests.xml
+nova/tests/cover/*
+nova/vcsversion.py
+tools/conf/nova.conf*
+*.log
+*.mo
+*.pyc
+*.sqlite
+*.DS_Store
+*.egg*