af-main: Fix service and their socket activation

af-main: Fix service and their socket activation

The method to create shared services using websockets
was buggy. This patch correct it. It creates the directories
'sockets.target.wants' were the socket activations units
will be linked. It also makes correct reload and improves
the used paths.

Also fixes a masty infinite loop (spec-663).

AGL-Bug: SPEC-670
AGL-Bug: SPEC-663

Change-Id: I39d93f669498354a1c2f96bd735c0318a2f0e93a
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/9787
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Romain Forlot <romain.forlot@iot.bzh>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>