tests: run in "set -x" mode if VERBOSE variable is non-null
tests: run in "set -x" mode if VERBOSE variable is non-null

* tests/init.sh: Enter "set -x" mode if $VERBOSE is non-null.

Saruta/strace,Distrotech/strace,vrastogi/strace,Distrotech/strace,vrastogi/strace,kapdop/android_external_strace,kapdop/android_external_strace,cuviper/strace,vrastogi/strace,cuviper/strace,vrastogi/strace,Distrotech/strace,Saruta/strace,kapdop/android_external_strace,Saruta/strace,vrastogi/strace,kapdop/android_external_strace,cuviper/strace,Saruta/strace,cuviper/strace,Saruta/strace,cuviper/strace,Distrotech/strace,kapdop/android_external_strace,Distrotech/strace