Merge pull request #879 from mposolda/master

Fix osgi packaging
Added CORS preflight support for realms/<realm>/tokens/refresh
Merge pull request #881 from rexorient/master

Added CORS preflight support for realms/<realm>/tokens/refresh
bump undertow version
Merge pull request #882 from patriot1burke/master

bump undertow version
Remove keycloak subsystem from AS7 dist.
Restore old AS7 subystem.
Merge pull request #880 from ssilvert/master

Restore old AS7 subsystem
fix proxy
Merge remote-tracking branch 'upstream/master'
Merge pull request #883 from patriot1burke/master

proxy fixes
rm adapters from appliance/war-dist
Merge pull request #884 from patriot1burke/master

rm adapters from appliance/war-dist
bump version
Merge pull request #885 from patriot1burke/master

bump version
bump
Merge pull request #886 from patriot1burke/master

bump
KEYCLOAK-879 Added missing transport element in clustering documentation