increase verbosity of checkNotNull calls
disable disk threshold allocation decider for crate test cluster
wait for discovery to discover missing node in python process tests
try fix some irregularly failing test methods
more verbose udc ping test
fix udc test when no hardware address can be determined
add missing ensureGreen() calls to TransportSQLActionTest
fix BlobEnvironmenttests on ubuntu
Merge pull request #1228 from crate/m/test_fixes

M/test fixes