Remove obsolete SQLAlchemy <0.8.0b2 restriction

Change-Id: I7b83226030ef7e4361db2f1c33d57a94b8567a28
Add delay in Selenium test to fix mOTP validate error

The window during which the same mOTP value is calculated is 10 seconds
long. If the second request to the server happens too early, then the
server rejects it. By explicitly pausing the test we make sure this
does not happen.

Change-Id: I6d7b8c858894d7243bce98fff3b8ec33704918f1
Merge "Remove obsolete SQLAlchemy <0.8.0b2 restriction"
Merge remote-tracking branch 'upstream/master'
Update to latest LinOTP head.