Fix wget and sleep 180

1. Fix the wget of cent_os and cosul_cluster BPs not over-writing old copies.
2. Replace sleep 180 after launching CM VM to a ping wait

Issue-Id: DCAEGEN2-128
Change-Id: I9ff8f770a320291c1c26d3c1159a52764d677f98
Signed-off-by: Lusheng Ji <lji@research.att.com>
1 file changed