refactored GPG and delivery_sched logic
restored test_submission UT
implemented https://github.com/globaleaks/GlobaLeaks/issues/491
enhanced test with log stdout, and new assertion overlay
completed test and code of https://github.com/globaleaks/GlobaLeaks/issues/511
reviewed pull/143; good work, corrected only some vecnish.
Merge pull request #143 from globaleaks/gpg-optimization

Gpg optimization