Ensure no connection pgbouncer -> test_db #521

This is needed to make the setup a little bit more robust: when trying
to delete the test database, it won't be able if there are "idle
sessions" in the db (that is, connections from pgbouncer to the test
database).

Otherwise it fails when trying to create the database, because there's
already one with the same name.

Author: Rafa de la Torre

test/prepare_db.sh

@@ -70,6 +70,7 @@ if test x"$PREPARE_PGSQL" = xyes; then
 
   echo "preparing postgres..."
   echo "PostgreSQL server version: `psql -A -t -c 'select version()'`"
+  echo "PAUSE; RESUME;" | psql -p 6432 pgbouncer # make sure there are no connections pgbouncer -> test_db
   dropdb ${TEST_DB} # 2> /dev/null # error expected if doesn't exist, but not otherwise
   createdb -Ttemplate_postgis -EUTF8 ${TEST_DB} || die "Could not create test database"
   psql -c 'CREATE EXTENSION IF NOT EXISTS "uuid-ossp";' ${TEST_DB}