Check is ansible is installed before running clean
Check is ansible is installed before running clean

Don't allow the clean-opsmgr.sh script to fail with a non-zero
return code if ansible hasn't been installed. If ansible hasn't been
installed yet, there is nothing to cleanup. Just exit with a return
code of 0.

Change-Id: I79dad55e18ca4b6ca44ede5ceb0a33430c076309

open-power-ref-design-toolkit/opsmgr,open-power-ref-design/opsmgr,open-power-ref-design-toolkit/opsmgr,open-power-ref-design/opsmgr,open-power-ref-design/opsmgr,open-power-ref-design-toolkit/opsmgr,open-power-ref-design-toolkit/opsmgr,open-power-ref-design/opsmgr,open-power-ref-design-toolkit/opsmgr,open-power-ref-design/opsmgr