backend: Two small style fixes
backend: Two small style fixes

- Pass keyword parameter as such
- Replace “not x == y” with “x != y”

Signed-off-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>
Reviewed-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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