logging: move logging into its own subdir

Some stuff we build (the DHCP manager) gets built independently
so that we can use it for unit tests.  For that, we need to build
the logging bits separately too, since the independent DHCP
library can't use them if they are embedded in NM.

src/named-manager/Makefile.am

@@ -1,4 +1,8 @@
-INCLUDES = -I${top_srcdir}/libnm-util -I${top_srcdir}/src -I${top_srcdir}/include
+INCLUDES = \
+	-I${top_srcdir}/src/logging \
+	-I${top_srcdir}/libnm-util \
+	-I${top_srcdir}/src \
+	-I${top_srcdir}/include
 
 noinst_LTLIBRARIES = libnamed-manager.la
 
@@ -10,4 +14,8 @@ libnamed_manager_la_CPPFLAGS = \
 	-DNM_PKGDATADIR=\"$(pkgdatadir)\" \
 	-DNM_LOCALSTATEDIR=\"$(localstatedir)\"
 
-libnamed_manager_la_LIBADD = $(DBUS_LIBS) $(GLIB_LIBS)
+libnamed_manager_la_LIBADD = \
+	$(top_builddir)/src/logging/libnm-logging.la \
+	$(DBUS_LIBS) \
+	$(GLIB_LIBS)
+