changed default user to eucalyptus. Fixes EUCA-7890.
made euca_user configurable. Fixes EUCA-7891.
workaround for nasty --initialize behavior. Fixes EUCA-7892.
Update INSTALL doc
--keys defaults to false. Fixes EUCA-7903.
Merge branch 'testing' of git.eucalyptus-systems.com:eucalyptus into testing
make sure keys backup exists (Fix EUCA-7941).