redfish power control dev scripts allow a failure to go undetected

[garlick]

Problem: when a power control command fails, the redfishpower expect scripts just expect the prompt so they succeed, and the failure is not reflected in the powerman command exit code.

[garlick]

Since copies of the redfishpower dev scripts with this error have proliferated, one fix for this that would not require those scripts to be tracked down and changed would be to make the redfishpower internal timeout infinite by default so it is always the powerman timeout which catches the error not the redfishpower one.

Edit: note that the internal timeout can now be changed via the dev script as of #72

[chu11]

going to close this, as the more general #171 will supplant this