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
fix flaky test by using REFRESH statement
add DEBUG_MODE constant to Constants

enabling that flag will result in more helpful stacktraces
from SQLActionExceptions which is very helpful during
development/debugging
implemented where clause splitter
Merge pull request #1198 from crate/m/where_splitter

implemented where clause splitter
move new relation classes into metadata package
renamed visitRelation
nested loop implementation
add a class to generate joinRelations from a list of analyzed relations

to rewrite select * from a, b -> select * from a cross join b
(and possible other join types in the future)
order by splitter
Merge pull request #1204 from crate/m/nestedloop

nested loop executor
Merge pull request #1207 from crate/h/orderby-splitter

orderby splitter