create project REST service will fail on adding maintainer

- we flush early and that causes an update when adding the user as maintainer, which then failed on update permission check because he is not yet a maintainer
fix test after change
Update H2 version used for tests.
rhbz1110627 - add REST endpoint for project config
Fix problem with repeatability of tests - https://github.com/zanata/zanata-server/pull/552

Upgrade H2 database version.
Indicate which tests simulate a session context.
Merge branch 'release' into integration/master
Merge pull request #520 from zanata/rhbz1110627-zanata-init

rhbz1110627 - add REST endpoint for project config
Merge branch 'master' into multi-file-upload
use canonical supported file types for project types