smalltown -> metropolis

This pass removes all mentions of Smalltown, both from code and comments,
and replaces them with appropriate new terminology.

Test Plan: Refactor, covered by CI.

X-Origin-Diff: phab/D674
GitOrigin-RevId: 04a94d44ef07d46f7821530da5614daefe16d7ea
diff --git a/build/print-workspace-status.sh b/build/print-workspace-status.sh
index fb46a5f..57138a4 100755
--- a/build/print-workspace-status.sh
+++ b/build/print-workspace-status.sh
@@ -5,8 +5,8 @@
 set -o nounset
 set -o pipefail
 
-# TODO: Figure out how to version Smalltown
-SIGNOS_VERSION=1.0.0-dev
+# TODO: Figure out how to version Metropolis
+METROPOLIS_VERSION=1.0.0-dev
 
 KUBERNETES_gitTreeState="clean"
 if [ ! -z "$(git status --porcelain)" ]; then
@@ -27,5 +27,5 @@
 KUBERNETES_buildDate $(date \
   ${SOURCE_DATE_EPOCH:+"--date=@${SOURCE_DATE_EPOCH}"} \
  -u +'%Y-%m-%dT%H:%M:%SZ')
-STABLE_SIGNOS_version $SIGNOS_VERSION
+STABLE_METROPOLIS_version $METROPOLIS_VERSION
 EOF