hvsupport: Adapt to vbox driver rewrite

Since vbox driver rewrite the virDriver structure init moved from
vbox_tmpl.c into vbox_common.c. However, our hvsupport.pl script
doesn't count with that. It still parses vbox_tmp.c and looks for
virDriver structure which is not found there anymore. As a result,
at hvsupport page is seems like vbox driver doesn't support
anything.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

docs/hvsupport.pl

@@ -28,7 +28,7 @@ my %groupheaders = (
 my @srcs;
 find({
     wanted => sub {
-        if (m!$srcdir/.*/\w+_(driver|tmpl|monitor|hal|udev)\.c$!) {
+        if (m!$srcdir/.*/\w+_(driver|common|tmpl|monitor|hal|udev)\.c$!) {
             push @srcs, $_ if $_ !~ /vbox_driver\.c/;
         }
     }, no_chdir => 1}, $srcdir);

src/vbox/vbox_driver.c

@@ -210,5 +210,5 @@ static virDrvOpenStatus dummyConnectOpen(virConnectPtr conn,
 static virDriver vboxDriverDummy = {
     VIR_DRV_VBOX,
     "VBOX",
-    .connectOpen = dummyConnectOpen,
+    .connectOpen = dummyConnectOpen, /* 0.6.3 */
 };