The dcae2_install script would bail due to "set -e" when docker
network is not configured.  This fix added additional clean up
checking.

Issue-ID: DCAEGEN2-1007
Change-Id: I5fa551fad498e311bfebe038416a7444b635d934
Signed-off-by: wrider <lji@research.att.com>
(cherry picked from commit d3d1abc2)