Replace grep | head | awk | tr | tr with awk.

Head was causing a SIGPIPE in grep that only appeared when using
distss.  This wasn't causing any build problems but spewed a lot
of warnings.

However, this change trims the command from 5 proccesses to 1 which is
nice.

Change-Id: Iac846ec1d01a022976cfc5fd28091a720ab161e7