xci: xci-deploy.sh: Calculate and print the total deployment time

xci: xci-deploy.sh: Calculate and print the total deployment time

It's useful to know how XCI performs in terms of duration time so
use the bash $SECONDS variable to calculate the total amount of time
it takes for a full XCI deployment. Moreover, use the 'ts' command to
print a timestamp for every command executed. This will help developers
identify tasks which take a lot of time to complete and possibly
optimize them.

Change-Id: I75a8cb8c05957bb205e63210d6cafaf54d989f32
Signed-off-by: Markos Chandras <mchandras@suse.de>