CXMAN-206: Remove error handling around bmc.check_firmware()
CXMAN-206: Remove error handling around bmc.check_firmware()

We expect it to raise a proper IpmiError now.

SilverLiningSystems/cxmanage-test,SilverLiningSystems/cxmanage-test2,Cynerva/cxmanage,SLS-Dev/cxmanage,SilverLiningSystems/cxmanage-test2,SLS-Dev/cxmanage,Cynerva/cxmanage,SilverLiningSystems/cxmanage-test