Tempest: wrap instance actions into inspector methods

This commit I4fe31ecae3393abc2779a5e80e348899f9113f1b broke inspector
tempest tests, it changes boot_instance and terminate_instance
signature.

This change redefine action methods

Change-Id: If6a9b300bd22e7b62b7e53763cb0328ad30f11c7
2 files changed