Small improvement to rpc-test
Small improvement to rpc-test

This will show smaller/better error messages: full node dumps are no
longer included.

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>
Reviewed-by: Guido Trotter <f62ca4d5358bdaeef0e50e57f9f7e231de63727e@google.com>

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