tests: when creating temp dirs, include test name in path

This makes it easier to figure out which directory we want to look at
when tests fail, and also which test left behind a directory when it
shouldn't.

src/partition/test-repart.sh

@@ -6,7 +6,7 @@ set -ex
 repart=$1
 test -x $repart
 
-D=$(mktemp --directory)
+D=$(mktemp --tmpdir --directory "test-repart.XXXXXXXXXX")
 trap "rm -rf '$D'" EXIT INT QUIT PIPE
 mkdir -p $D/definitions
 

test/hwdb-test.sh

@@ -18,7 +18,7 @@ if [ ! -x "$SYSTEMD_HWDB" ]; then
     exit 1
 fi
 
-D=$(mktemp --directory)
+D=$(mktemp --tmpdir --directory "hwdb-test.XXXXXXXXXX")
 trap "rm -rf '$D'" EXIT INT QUIT PIPE
 mkdir -p "$D/etc/udev"
 ln -s "$ROOTDIR/hwdb.d" "$D/etc/udev/hwdb.d"

test/test-network-generator-conversion.sh

@@ -17,7 +17,7 @@ for f in "$src"/test-*.input; do
     echo "*** Running $f"
 
     (
-        out=$(mktemp --directory)
+        out=$(mktemp --tmpdir --directory "test-network-generator-conversion.XXXXXXXXXX")
         trap "rm -rf '$out'" EXIT INT QUIT PIPE
 
         $generator --root "$out" -- $(cat $f)