MDEV-30402: Encrypted mariabackup SST breaks on distributions with newer socat

This commit adds a new 'no-sni' option to socat which is required to
properly authenticate with newer socat versions (after version 1.7.4+).
This option is needed to disable the automatic use of the SNI feature
(Server Name Indication) since the SST script directly specifies the
commonname if necessary and automatic activation of the SNI feature
is unnecessary in such scenarios.

scripts/wsrep_sst_mariabackup.sh

@@ -340,6 +340,9 @@ get_transfer()
                         "Use workaround for socat $SOCAT_VERSION bug"
                 fi
             fi
+            if check_for_version "$SOCAT_VERSION" '1.7.4'; then
+                tcmd="$tcmd,no-sni=1"
+            fi
         fi
 
         if [ "${sockopt#*,dhparam=}" = "$sockopt" ]; then