Remove non-existing arguments from some docstrings
Remove non-existing arguments from some docstrings

A fewdocstrings in the HooksRunner backend class list arguments the relevant
functions do not take.  Clean them up.

Reviewed-by: iustinp



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