Update get next domain to be able to
include disbled domains and change the
interface to accept flags instead of
multiple booleans.

Ticket:
https://fedorahosted.org/sssd/ticket/2673

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

It seems that gcc 5.1 optimize enum in some ways and expects that
unctions ifp_cache_build_path and ifp_cache_build_base_dn
can return unitialized value due to missing default in switch.

src/responder/ifp/ifp_cache.c:118:13: warning: 'base_dn' may be used uninitialized in this function [-Wmaybe-uninitialized]
     ldb_ret = ldb_search(sysdb_ctx_get_ldb(domain->sysdb), tmp_ctx, &result,
             ^

src/responder/ifp/ifp_cache.c: scope_hint: In function 'ifp_cache_get_cached_objects'
src/responder/ifp/ifp_cache.c:135:18: warning: 'path' may be used uninitialized in this function [-Wmaybe-uninitialized]
         paths[i] = ifp_cache_build_path(paths, type, domain, result->msgs[i]);
                  ^

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

IFP now exports cached users and groups in introspection.

After a user is cached with:
    dbus-send --print-reply --system \
              --dest=org.freedesktop.sssd.infopipe \
              /org/freedesktop/sssd/infopipe/Users/ipaldap/397400000 \
              org.freedesktop.sssd.infopipe.Cache.Object.Store

And Introspection called with:
    dbus-send --print-reply --system \
              --dest=org.freedesktop.sssd.infopipe \
                /org/freedesktop/sssd/infopipe/Users \
                org.freedesktop.DBus.Introspectable.Introspect

The cached users would be visible in the Introspection XML as:
  <node name="ipaldap/397400000" />
  </node>

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

Resolves:
https://fedorahosted.org/sssd/ticket/2338

Example use:
 $ dbus-send --print-reply --system \
             --dest=org.freedesktop.sssd.infopipe \
             /org/freedesktop/sssd/infopipe/Users \
             org.freedesktop.sssd.infopipe.Users.FindByName \
             string:admin

   object path "/org/freedesktop/sssd/infopipe/Users/ipaldap/397400000"

 $ dbus-send --print-reply --system \
             --dest=org.freedesktop.sssd.infopipe \
             /org/freedesktop/sssd/infopipe/Users \
             org.freedesktop.sssd.infopipe.Cache.List

   array [
   ]

 $ dbus-send --print-reply --system \
             --dest=org.freedesktop.sssd.infopipe \
             /org/freedesktop/sssd/infopipe/Users/ipaldap/397400000 \
             org.freedesktop.sssd.infopipe.Cache.Object.Store

   boolean true

 $ dbus-send --print-reply --system \
             --dest=org.freedesktop.sssd.infopipe \
             /org/freedesktop/sssd/infopipe/Users \
             org.freedesktop.sssd.infopipe.Cache.List

   array [
      object path "/org/freedesktop/sssd/infopipe/Users/ipaldap/397400000"
   ]

 $ dbus-send --print-reply --system \
             --dest=org.freedesktop.sssd.infopipe \
             /org/freedesktop/sssd/infopipe/Users/ipaldap/397400000 \
             org.freedesktop.sssd.infopipe.Cache.Object.Remove

   boolean true

 $ dbus-send --print-reply --system \
             --dest=org.freedesktop.sssd.infopipe \
             /org/freedesktop/sssd/infopipe/Users \
             org.freedesktop.sssd.infopipe.Cache.List

   array [
   ]

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>