shared: add parser for SocketBind{Allow|Deny}=

Parse address family, ip protocol and ports, any of them can be
optional. If neither is specified, a special value 'any' is expected.
Helper is placed in shared to be reused in both fragment and dbus.
Add unit tests with valid and invalid examples.

src/shared/meson.build

@@ -225,6 +225,8 @@ shared_sources = files('''
         pager.h
         parse-argument.c
         parse-argument.h
+        parse-socket-bind-item.c
+        parse-socket-bind-item.h
         pe-header.h
         pkcs11-util.c
         pkcs11-util.h