Flush memcached whenever we drop the databases.

This fixes some issues that we've had where commands will fail is
confusing ways after the database is rebuilt because data from before
the database was dropped is still in the memcached cache.

scripts/setup/flush-memcached

@@ -0,0 +1,4 @@
+#!/bin/sh -xe
+
+# Flush memcached
+echo 'flush_all' | nc localhost 11211

scripts/setup/postgres-init-db

@@ -15,5 +15,7 @@ CREATE SCHEMA zulip AUTHORIZATION zulip;
 CREATE EXTENSION tsearch_extras SCHEMA zulip;
 EOF
 
+sh "$(dirname "$0")/flush-memcached"
+
 echo "Database created"
 

tools/do-destroy-rebuild-database

@@ -5,6 +5,8 @@ DROP DATABASE IF EXISTS zulip;
 CREATE DATABASE zulip TEMPLATE zulip_base;
 EOF
 
+sh "$(dirname "$0")/../scripts/setup/flush-memcached"
+
 python manage.py migrate --noinput
 python manage.py createcachetable third_party_api_results
 python manage.py populate_db -n100 --threads=1

tools/generate-fixtures

@@ -15,6 +15,7 @@ if [ "$template_grep_error_code" == "0" ]; then
 DROP DATABASE IF EXISTS zulip_test;
 CREATE DATABASE zulip_test TEMPLATE zulip_test_template;
 EOF
+        sh "$(dirname "$0")/../scripts/setup/flush-memcached"
         exit 0
     fi
 fi
@@ -25,6 +26,7 @@ psql -h localhost postgres zulip_test <<EOF
 DROP DATABASE IF EXISTS zulip_test;
 CREATE DATABASE zulip_test TEMPLATE zulip_test_base;
 EOF
+sh "$(dirname "$0")/../scripts/setup/flush-memcached"
 
 python manage.py migrate --noinput --settings=zproject.test_settings
 migration_status "zerver/fixtures/migration-status"

tools/postgres-init-dev-db

@@ -67,5 +67,7 @@ psql -h localhost postgres "$USERNAME" <<EOF
 CREATE DATABASE $DBNAME TEMPLATE $DBNAME_BASE;
 EOF
 
+sh "$(dirname "$0")/../scripts/setup/flush-memcached"
+
 echo "Database created"