Move connection driver modules directory

When built as modules, the connection drivers live
in $LIBDIR/libvirt/drivers. Now we add lock manager
drivers, we need to distinguish. So move the existing
modules to 'connection-driver'

* src/Makefile.am: Move module install dir
* src/driver.c: Move module search dir

src/Makefile.am

@@ -29,7 +29,7 @@ endif
 
 lib_LTLIBRARIES = libvirt.la libvirt-qemu.la
 
-moddir = $(libdir)/libvirt/drivers
+moddir = $(libdir)/libvirt/connection-driver
 mod_LTLIBRARIES =
 
 confdir = $(sysconfdir)/libvirt

src/driver.c

@@ -30,7 +30,7 @@
 #include "util.h"
 #include "configmake.h"
 
-#define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/drivers"
+#define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/connection-driver"
 
 /* Make sure ... INTERNAL_CALL can not be set by the caller */
 verify((VIR_SECRET_GET_VALUE_INTERNAL_CALL &