src/core/automount: use DirectoryMode when calling mkdir -p

src/core/automount: use DirectoryMode when calling mkdir -p

mkdir -p is called both when setting up the autofs mount, as well
as after being notified that the real mount unit should be called.
However the first mkdir -p is hardcoded with 0555, while the second
uses the value specified to DirectoryMode in the automount unit; the
second mkdir -p is only needed when called from coldplug, so under
normal operation the dirs are incorrectly created with mode 0555.

This replaces the hardcoded 0555 mode with the value of DirectoryMode.

Closes #13683.

(cherry picked from commit 8084dcb9d759e93669127f200bf5ca755432b96e)
(cherry picked from commit f406a691a7229628781686dfce4c8e276e1d46e3)

Gbp-Pq: Name src-core-automount-use-DirectoryMode-when-calling-mkdir-p.patch