Removed bare excepts
replaced "except as" syntax w/ 2.4 compatible comma syntax
replace assertions, raise ValueError instead
update steps to use requiredArgs
Fix failing test & shell command
check rc in a callback (errback is not called)
send headers and errno for failed fs commands
removed blank line
Merge jpommerening/buildbot:slave-fs-cmds-cleanup (PR #1066)
Merge branch 'master' into nine
make 'grunt ci' failures a warning unti #2700 is fixed