util-linux: rewrite the ptest integration

Instead of duplicating logic, we can use the run.sh that the test suite
installs.

Unless told otherwise, the util-linux test suite assumes that it is
running in a build tree and looks for binaries to run, but we're on
target so pass --use-system-commands (drops ~180 skips to tens).

Add --show-diff so that debugging can be done from the logs alone.

Remove redundant path manipulation that is now done upstream.

If PAM is disabled, delete the chfn test: it will run the chfn from
shadow which has different output, and the test will fail.

[ YOCTO #14244 ]

(From OE-Core rev: 720660b936b5523ec48a7c04712d10c88198e12c)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/util-linux/util-linux/run-ptest

@@ -13,31 +13,12 @@ current_path=$(readlink -f $0)
 export bindir=$(dirname $current_path)
 export PATH=$bindir/bin:$PATH
 
-cd tests || exit 1                                                          
-
-comps=$(find ts/ -type f -perm -111 -regex ".*/[^\.~]*" |  sort)
-
-
-echo
-echo "-------------------- util-linux regression tests --------------------"
-echo
-echo "                    For development purpose only.                    "
-echo "                 Don't execute on production system!                 "
-echo
-
-res=0
-count=0
-for ts in $comps; 
-do 
-   $ts | sed -u '{        
+./tests/run.sh --use-system-commands --parsable --show-diff | sed -u '{
       s/^\(.*\):\(.*\) \.\.\. OK$/PASS: \1:\2/                              
       s/^\(.*\):\(.*\) \.\.\. FAILED \(.*\)$/FAIL: \1:\2 \3/                
       s/^\(.*\):\(.*\) \.\.\. SKIPPED \(.*\)$/SKIP: \1:\2 \3/               
-   }' 
-done
-
+   }'
 
 if [ "x$UDEV_PID" != "x" ]; then
     /etc/init.d/udev start
 fi
-