Don't use PRUN on a command that has a pipe "|"
Don't use PRUN on a command that has a pipe "|"

Otherwise we get binary content (images) in the log file.

Change-Id: I4f1d1bc22adc145f7e7ee668538afdac72ac9e6a
Closes-bug: #1350645

ed-/solum,gilbertpilz/solum,ed-/solum,openstack/solum,openstack/solum,gilbertpilz/solum,devdattakulkarni/test-solum,gilbertpilz/solum,stackforge/solum,stackforge/solum,ed-/solum,gilbertpilz/solum,ed-/solum,devdattakulkarni/test-solum