tools: Remove unused deployment-lock-ctl.

This interacted with a deployment locking system that is no longer
part of the project.

tools/deployment-lock-ctl

@@ -1,53 +0,0 @@
-#!/bin/bash
-
-command="$0"
-lockdir="deployments/lock"
-
-function usage {
-echo "$command <command> [target]
-
-Manages the lock state of staging and prod deployments.
-
-    lock target         locks a logical target
-    unlock target       unlocks a logical target
-    status              shows the deployment lock state on various hosts"
-exit 1
-}
-
-
-if [[ $# -lt 1 || $# -gt 2 ]]; then
-    usage
-fi
-
-function get_status {
-    if (ssh "zulip@$1.zulip.net" '[ -d "'"$lockdir"'" ]'); then
-        printf "%-10s %b" "$1" "is currently \e[31mlocked\e[0m\n"
-    else
-        printf "%-10s %b" "$1" "is currently \e[32munlocked\e[0m\n"
-    fi
-}
-
-if [[ "$1" == "lock" ]]; then
-    verb="mkdir"
-elif [[ "$1" == "unlock" ]]; then
-    verb="rmdir"
-elif [[ $# == 1 && "$1" == "status" ]]; then
-    get_status "staging"
-    get_status "prod0"
-    exit
-else
-    usage
-fi
-
-
-if [[ "$2" == "staging" ]]; then
-    ssh zulip@staging.zulip.net "$verb $lockdir"
-    get_status "staging"
-    exit
-elif [[ "$2" == "prod" ]]; then
-    ssh zulip@prod0.zulip.net "$verb $lockdir"
-    get_status "prod0"
-    exit
-else
-    usage
-fi