Send entire families to ospd-openvas using VT_GROUP

[mattmundell]

What:

When a config family is "growing" and includes all NVTs, then send the family to ospd-openvas using a single OSP VT_GROUP instead of many VT_SINGLEs.

Why:

• Neater.
• Saves some comm between gvmd and ospd.
• Allows ospd-openvas to easily swap out whatever is going to produce the results (for example, using a new scanner instead of openvas).

How did you test it:

Log OSP in gvm-libs and check that the VT_GROUPs are sent.

+++ b/util/serverutils.c
@@ -751 +751 @@ gvm_server_vsendf (gnutls_session_t *session, const char *fmt, va_list ap)
-  return gvm_server_vsendf_internal (session, fmt, ap, 0);
+  return gvm_server_vsendf_internal (session, fmt, ap, 1);

Checklist:

• Tests
• CHANGELOG Entry