Add two specialized Luxi calls
Add two specialized Luxi calls

This are higher level wrappers over the basic callMethod.

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

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