Bug 497512 - cdtdebug.sh "bashisms" not supported by non-bash shells

Also include the latest version of plugins when launching
(tail vs head). This makes a difference when the plugins were
updated.

Change-Id: Id97c9247f0507e177592ca3631348bf8f7fd3dbf
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>