switch build container to match SO

Signed-off-by: Jeremy Mordkoff <jeremy.mordkoff@gmail.com>

jenkins/UI/SETTINGS

@@ -21,7 +21,7 @@ export OSM_BASE_IMAGE=ubuntu:16.04
 #
 # this variable holds the name of the container to be used to build a package
 # if this container already exists, the build process can skip the container build
-export OSM_BUILD_CONTAINER=UI-ub
+export OSM_BUILD_CONTAINER=SO-ub
 #
 # this variable must be set to allow creating the build container in privileged mode
 # this variable should be removed in the future when no privileged mode is required