feature powerman address review comments pass 1

Removed static manpage which will be auto-generated from metadata
Removed unnecessary run_delay() call in main
Create option to set path to powerman binary
Verify powerman binary is executable
Removed redundant default ipport
Removed unnecessary debug logging of raw arguments
Removed unnecessary reboot function, implemented in a

way that made it no better than the one already
implemented within lib/fencing.py

Return value of monitor action is 'error' if powerman not running