net-misc/networkmanager: create /run/NetworkManager earlier

net-misc/networkmanager: create /run/NetworkManager earlier

NetworkManager itself creates /run/NetworkManager very early on in
its main(), but the OpenRC init file also wants to put the
start-stop-daemon pidfile in it.
It seems to have been working well enough for most people
regardless, but there is still a very real race condition and
bug here, which appears to get triggered for more users with
the p.masked networkmanager versions as well.
Hopefully fix it by creating the directory in start_pre() like other
packages making use of a subdirectory pidfile do, with the same
permissions as NetworkManager itself will/would create it.

Package-Manager: Portage-2.3.84, Repoman-2.3.20
Signed-off-by: Mart Raudsepp <leio@gentoo.org>