Fix htools/rpc-test after recent changes
Fix htools/rpc-test after recent changes

Since this program is not built normally, a few recent commits broke
it:

- 707cd3d (“Use exitErr instead of explicit error message and
  exitWith”) introduced wrong syntax (missing '$')
- 29a3053 (“Remove unsafePerformIO usage”) changed the signature of
  G.Path.clusterConfFile
- 5183e8b (“Convert query path from string errors to GanetiException”)
  changed the signature of 'getNode'

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

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