[vs tests] Uninstall swss before installing it for dvs test runs (sonic-net#73)

Signed-off-by: Danny Allen <[email protected]>

Author: daall

scripts/vs/sonic-swss-build/docker-sonic-vs/Dockerfile

@@ -13,7 +13,9 @@ RUN dpkg -i /debs/syncd-vs_1.0.0_amd64.deb
 RUN md5sum /debs/swss_1.0.0_amd64.deb
 RUN md5sum /usr/bin/buffermgrd
 RUN md5sum /usr/bin/orchagent
-RUN dpkg -i /debs/swss_1.0.0_amd64.deb
+
+RUN dpkg -i --force-all /debs/swss_1.0.0_amd64.deb
+
 RUN md5sum /debs/swss_1.0.0_amd64.deb
 RUN md5sum /usr/bin/buffermgrd
 RUN md5sum /usr/bin/orchagent