config: put version in configuration as a proper value

Adds a new field, "suricata-version" to the configuration file with
the major and minor version of the Suricata that generated the
configuration file.

This may be useful in the future for presenting warnings about
important changes, or even providing different defaults based on what
the user might expect.

Ticket: 5822

configure.ac

@@ -2447,6 +2447,9 @@ return 0;
         fi
     fi
 
+# get MAJOR_MINOR version for embedding in configuration file.
+    MAJOR_MINOR=`expr "${PACKAGE_VERSION}" : "\([[0-9]]\+\.[[0-9]]\+\).*"`
+
 if test "${enable_ebpf}" = "yes" || test "${enable_unittests}" = "yes"; then
   AC_DEFINE([CAPTURE_OFFLOAD_MANAGER], [1],[Building flow bypass manager code])
 fi
@@ -2546,6 +2549,7 @@ AC_SUBST(CONFIGURE_SYSCONDIR)
 AC_SUBST(CONFIGURE_LOCALSTATEDIR)
 AC_SUBST(CONFIGURE_DATAROOTDIR)
 AC_SUBST(PACKAGE_VERSION)
+AC_SUBST(MAJOR_MINOR)
 AC_SUBST(RUST_FEATURES)
 AC_SUBST(RUST_SURICATA_LIBDIR)
 AC_SUBST(RUST_SURICATA_LIBNAME)

suricata.yaml.in

@@ -4,9 +4,9 @@
 # Suricata configuration file. In addition to the comments describing all
 # options in this file, full documentation can be found at:
 # https://suricata.readthedocs.io/en/latest/configuration/suricata-yaml.html
-#
-# This configuration file generated by:
-#     Suricata @PACKAGE_VERSION@
+
+# This configuration file generated by Suricata @PACKAGE_VERSION@.
+suricata-version: "@MAJOR_MINOR@"
 
 ##
 ## Step 1: Inform Suricata about your network