engine : Rename TaskManagerUtil to CommandCoordinatorUtil

Rename TaskManagerUtil to CommandCoordinatorUtil

Change-Id: Idf796edd6c0812dac03bbf1e71b637e9d2b452e5
Bug-Url: https://bugzilla.redhat.com/1127774
Signed-off-by: Ravi Nori <rnori@redhat.com>