nuageinit: fix test after recent behaviour change

with recent change nuageinit always create a "freebsd" user, if no
users are specified, which means we do need to get the rootdir in the
testsuite containing a group file otherwise pw complains and the tests
fails.

libexec/nuageinit/tests/nuageinit.sh

@@ -59,6 +59,7 @@ args_body()
 nocloud_body()
 {
 	mkdir -p media/nuageinit
+	setup_test_adduser
 	atf_check -s exit:1 -e match:"nuageinit: error parsing nocloud.*" /usr/libexec/nuageinit "${PWD}"/media/nuageinit/ nocloud
 	printf "instance-id: iid-local01\nlocal-hostname: cloudimg\n" > "${PWD}"/media/nuageinit/meta-data
 	atf_check -s exit:0 /usr/libexec/nuageinit "${PWD}"/media/nuageinit nocloud
@@ -220,6 +221,7 @@ EOF
 config2_body()
 {
 	mkdir -p media/nuageinit
+	setup_test_adduser
 	atf_check -s exit:1 -e match:"nuageinit: error parsing config-2 meta_data.json:.*" /usr/libexec/nuageinit "${PWD}"/media/nuageinit config-2
 	printf "{}" > media/nuageinit/meta_data.json
 	atf_check /usr/libexec/nuageinit "${PWD}"/media/nuageinit config-2
@@ -335,6 +337,7 @@ EOF
 config2_network_body()
 {
 	mkdir -p media/nuageinit
+	setup_test_adduser
 	printf "{}" > media/nuageinit/meta_data.json
 	mynetworks=$(ifconfig -l ether)
 	if [ -z "$mynetworks" ]; then
@@ -401,6 +404,7 @@ EOF
 config2_network_static_v4_body()
 {
 	mkdir -p media/nuageinit
+	setup_test_adduser
 	printf "{}" > media/nuageinit/meta_data.json
 	mynetworks=$(ifconfig -l ether)
 	if [ -z "$mynetworks" ]; then