Extend checks for moving home directory

Add hard link to files inside or outside the home directory)
Add files with user or group owner different from the user.

tests/usertools/usermod/49_usermod_change_gid+move_homedir_other_device/data/home_ls-a

@@ -1,5 +1,10 @@
+-rw-r--r-- 0:1001 `/home/foo2/uroot'
+-rw-r--r-- 1000:0 `/home/foo2/groot'
 -rw-r--r-- 1000:1001 `/home/foo2/.tata'
+-rw-r--r-- 1000:1001 `/home/foo2/.tyty'
+-rw-r--r-- 1000:1001 `/home/foo2/profile2'
 -rw-r--r-- 1000:1001 `/home/foo2/toto'
+-rw-r--r-- 1000:1001 `/home/foo2/tyty'
 crw-r--r-- 1000:1001 `/home/foo2/null'
 drwxr-xr-x 0:0 `/home/foo2/..'
 drwxr-xr-x 1000:1001 `/home/foo2/.'

tests/usertools/usermod/49_usermod_change_gid+move_homedir_other_device/usermod.test

@@ -19,10 +19,17 @@ change_config
 mkdir /home/foo
 mkdir /home/foo/titi
 echo toto > /home/foo/toto
+echo tyty > /home/foo/tyty
 ln /home/foo/toto /home/foo/.tata
+ln /home/foo/tyty /home/foo/.tyty
 ln -s /home/foo/toto /home/foo/tutu
 mknod /home/foo/null c 1 3
+ln /etc/profile /home/foo/profile2
+echo root > /home/foo/uroot
+echo root > /home/foo/groot
 chown -R foo:foo /home/foo
+chown root /home/foo/uroot
+chgrp root /home/foo/groot
 stat --printf "%A %u:%g %N\n" /home/foo/* /home/foo/.* 2>/dev/null | sort
 
 mkdir /tmp/home
@@ -54,6 +61,17 @@ echo -n "Check content of /tmp/test-newusers..."
 stat --printf "%A %u:%g %N\n" /home/foo2/* /home/foo2/.* 2>/dev/null | sort > tmp/home_ls-a
 diff -rauN data/home_ls-a tmp/home_ls-a
 echo "OK"
+echo -n "Check that hardlink to another homedir file remains a hardlink..."
+dev_ino=$(stat --printf "%d-%i" /home/foo2/toto)
+dev_ino2=$(stat --printf "%d-%i" /home/foo2/.tata)
+test "$dev_ino" = "$dev_ino2"
+echo "OK"
+echo -n "Check hardlink to outside the homedir..."
+dev_ino=$(stat --printf "%d-%i" /etc/profile)
+dev_ino2=$(stat --printf "%d-%i" /home/foo2/profile2)
+echo "$dev_ino" != "$dev_ino2"
+#test "$dev_ino" = "$dev_ino2"
+echo "NOT IMPLEMENTED"
 rm -f tmp/home_ls-a
 
 echo -n "Remove the new home directory..."