Description of problem:

installing new host, deployUtil makeBridge function uses default value of 'rhevm' as a constant, host installation pass but when host fails activation as CAN_DO action on engine side tests bridge name which requires engine and not rhevm.

when resolving this issue, please address the following matter as well:

- check existing bridge
   * if rhevm bridge already exists with name 'rhevm'; don't skip, but remove   
     existing bridge, and add new one with engine name

git hash:  6b0a82392c2e4e3095b11787eb324e35eeecbd4f

repro steps: 

- install new host. 

from deployUtil:

82 MGT_BRIDGE_NAME = "rhevm"