Kw fix
IPMI plugin

When get_bmc_cred fails in an aggregator, and no other compute node
sends the ipmi credential data, the aggregator tries to read its
bmc credential in a loop. Implemented a timeout as well as printing out
a debug message indicating the issue. Refs #35
Klocwork fixes

added a null check for the return parameter of opal_os_path function
call in freq & coretemp plugins

Conflicts:
	orcm/mca/sensor/freq/sensor_freq.c
Fix syntax and in turn the build break