[#858] Tests: getiCmdBoolean options: MULTILINE, regex; tearDown "rum"

getiCmdBoolean outputtypes LIST and ERROR aliased to STDOUT and STDERR,
respectively.

getiCmdBoolean now has STDOUT_MULTILINE and STDERR_MULTILINE which will
search entire output for expected results, instead of requiring that
all expected results be on the same line of output

getiCmdBoolean has use_regex option which interprets expectedresults
strings as python regexes

admin_down in pydevtest_sessions now runs 'iadmin rum' for increased
test idempotency