Enable archive pattern support

lftools deploy supports archiving using patterns via the -p argument.
Pass in this argument if the env variable ARCHIVE_ARTIFACTS is defined.
If variable is not defined or blank then a blank string gets passed in
which still works.

Change-Id: I4d096ea9ad1b0c93864d37c6188f02f7e32f6228
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>