LUSetInstanceParams: use the correct hvparams
LUSetInstanceParams: use the correct hvparams

In LUSetInstanceParam we used to save the dict without defaults for the
instance params as hv_inst, but to use the populated one for the
instance (hv_new). Fixing this leads to instances without all the
parameters set.

Reviewed-by: iustinp


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