Commit36b59c001cintroduces DIB_DEBUG_TRACE, to be checked in element scripts for enabling tracing. In the aforementioned conversion, few scripts were left with unconditional "set -x" calls: remove them, changing the default value for unset DIB_DEBUG_TRACE from 0 to 1, to retain their older behaviour (as it was done in36b59c001ctoo). Change-Id: I3d1a9290021bf63de7d4e7752e809852e784ac8b