test: new test, verify env:file variable expansion

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/Makefile.am

@@ -32,6 +32,7 @@ EXTRA_DIST		+= crashing.sh
 EXTRA_DIST		+= depserv.sh
 EXTRA_DIST		+= devmon.sh
 EXTRA_DIST		+= failing-sysv.sh
+EXTRA_DIST		+= svc-env.sh
 EXTRA_DIST		+= global-envs.sh
 EXTRA_DIST		+= initctl-status-subset.sh
 EXTRA_DIST		+= notify.sh
@@ -76,6 +77,7 @@ TESTS			+= crashing.sh
 TESTS			+= depserv.sh
 TESTS			+= devmon.sh
 TESTS			+= failing-sysv.sh
+TESTS			+= svc-env.sh
 TESTS			+= global-envs.sh
 TESTS			+= initctl-status-subset.sh
 TESTS			+= notify.sh