Remove power templates not supported anymore by fence-agents
Rename power templates from power_* to fence_*

Old power template names were not used by Cobbler, as it
always looks for fence_* and name was power_*.
Fix power template format

fence-agents input format changed recently and it was not updated in
power templates.

Tested templates: bladecenter, lpar and rsa
Merge pull request #710 from alanoe/alanoe/fix_power_templates

Fix power templates