Restart dead server in jedi:start-server
Fix typo
Do not try dot-complete when in string literal etc.
Respect global jedi:server-args when importing python.el settings
Fix test failures due to incomplete mocking

As of e7ce66aa65bca0a4f4eb277090cb9e2af956e285,
jedi:epc--live-p was called in jedi:start-server
therefore I need to fix mock for this function.