Comment 3 for bug 1248212

Had few points to share
1. agree to the fact that the usage should be consistent throughout the code.
2. however, i tried to read through the code, found that mount_point paramter is everywhere derived from conf.mount_point itself.
3. going forward my thought is to change the conf.mount_point to mount_point in guestagent code which is received as a parameter in prepare method. or the other way is remove the mount_point parameter from prepare method and use conf.mount_point everywhere.