run BATS tests in Cirrus

I'm running the BATS tests manually once in a while, and
catching several problems each week that make it past
the rest of CI. Since the BATS tests run at RPM gating
time, we need to catch problems earlier. Try running
the tests from Cirrus.

Tests will be skipped on Ubuntu due to a too-ancient
version of coreutils (8.28; the 'timeout -v' we use
requires 8.29).

Tests are run *after* integration tests, even though
these take three minutes and would be nice to have
fail quickly, because running before causes bizarre
CI failures. Shrug.

UPDATE: also fix run test, broken by #3311.

Signed-off-by: Ed Santiago <santiago@redhat.com>

contrib/cirrus/system_test.sh

@@ -1,21 +0,0 @@
-#!/bin/bash
-
-set -e
-source $(dirname $0)/lib.sh
-
-req_env_var GOSRC OS_RELEASE_ID OS_RELEASE_VER
-
-set -x
-cd "$GOSRC"
-
-case "${OS_RELEASE_ID}" in
-    ubuntu) ;&  # Continue to the next item
-    fedora)
-        make install.tools
-        make
-        make test-binaries
-        ;;
-    *) bad_os_id_ver ;;
-esac
-
-make localsystem

contrib/cirrus/system_test.sh

@@ -0,0 +1 @@
+integration_test.sh