CreateInstance: allow no ip check with start mode
CreateInstance: allow no ip check with start mode

Since gnt-instance start doesn't do any checks on the IP, it doesn't
make much sense to do so in instance create (with start) if the user
expressly passes in ‘--no-ip-check’. Removing this requirement eases the
no-name-check mode (otherwise one would have to create --no-start and
then only start).

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

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