Convert backend.py
Convert backend.py

Replacing ssconf with simpleconfig.

Reviewed-by: iustinp


grnet/snf-ganeti,leshchevds/ganeti,andir/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,leshchevds/ganeti,grnet/snf-ganeti,bitemyapp/ganeti,apyrgio/snf-ganeti,andir/ganeti,yiannist/ganeti,onponomarev/ganeti,dimara/ganeti,onponomarev/ganeti,mbakke/ganeti,mbakke/ganeti,mbakke/ganeti,bitemyapp/ganeti,ganeti/ganeti,dimara/ganeti,apyrgio/snf-ganeti,yiannist/ganeti,apyrgio/ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,yiannist/ganeti,andir/ganeti,leshchevds/ganeti,ganeti/ganeti