Add explicit test for wrong OpCode arbitrary instances
Add explicit test for wrong OpCode arbitrary instances

I've been bitten a couple of times with arbitrary opcodes working on
UTF-8 locale, but failing on buildbot (ASCII). So let's add an
explicit test that checks always (even with UTF-8) for correct
arbitrary values, showing explicitly which opcodes fail.

Signed-off-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>
Reviewed-by: Helga Velroyen <2d0126b1ec6f9ec5cbec4a7012aa14faeaef10f5@google.com>

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