Made is_leader and is_not_leader log messages useful.
Fixed mixed cluster test race condition.

Letting cluster settle before attempting to push data. Also fixed some
whitespace.
Made timeouts config based.
Added wait to avoid upgrade test race condition.

The tests would error out due to noproc to riak_core_cluster_manager. Add
a wait until that process is registered on each node in the context setup.
This could also have manifested in a write not getting everywhere in the
first generated test case, but not the rest.
Fixed occasional mixed cluster up test

Addeed a further wait for after upgrading the first node before checking
cascades.
Fixed a typo.
Merge pull request #299 from basho/mw-fix-repl-rt-cascading

Mw fix repl rt cascading