Convert developer setup scripts away from Gerrit Code Review

KWSys development is moving away from the Gerrit Code Review system.
Disable portions of `SetupForDevelopment.sh` related to Gerrit.

GitSetup/config

 [hooks]
-	url = http://public.kitware.com/GitSetup.git
-[gerrit]
-	project = KWSys
-	site = http://review.source.kitware.com
-	pushurl = $username@review.source.kitware.com:KWSys
+	url = https://gitlab.kitware.com/utils/gitsetup.git
+[upstream]
+	url = https://gitlab.kitware.com/utils/kwsys.git

GitSetup/setup-aliases

 #!/usr/bin/env bash
 echo "Adding 'git prepush' alias" &&
 git config alias.prepush 'log --graph --stat origin/master..' &&
-echo "Adding 'git gerrit-push' alias" &&
-git config alias.gerrit-push "!bash GitSetup/git-gerrit-push" &&
+gerrit_disabled="KWSys no longer uses Gerrit.  Please use GitLab." &&
+git config alias.gerrit-push '!sh -c "echo '"${gerrit_disabled}"'"' &&
 true

SetupForDevelopment.sh

@@ -3,14 +3,18 @@
 cd "${BASH_SOURCE%/*}" &&
 GitSetup/setup-user && echo &&
 GitSetup/setup-hooks && echo &&
-GitSetup/setup-gerrit && echo &&
 GitSetup/setup-aliases && echo &&
+GitSetup/setup-upstream && echo &&
 GitSetup/tips
 
 # Rebase master by default
 git config rebase.stat true
 git config branch.master.rebase true
 
+# Disable Gerrit hook explicitly so the commit-msg hook will
+# not complain even if some gerrit remotes are still configured.
+git config hooks.GerritId false
+
 # Record the version of this setup so Scripts/pre-commit can check it.
-SetupForDevelopment_VERSION=1
+SetupForDevelopment_VERSION=2
 git config hooks.SetupForDevelopment ${SetupForDevelopment_VERSION}