MEDIUM: server: remove experimental-mode for dynamic servers

Dynamic servers feature is now judged to be stable enough. Remove the
experimental-mode requirement for "add/del server" commands. This should
facilitate dynamic servers adoption.
diff --git a/reg-tests/ssl/dynamic_server_ssl.vtc b/reg-tests/ssl/dynamic_server_ssl.vtc
index e498a81..b7730f5 100644
--- a/reg-tests/ssl/dynamic_server_ssl.vtc
+++ b/reg-tests/ssl/dynamic_server_ssl.vtc
@@ -70,11 +70,11 @@
 	expect ~ ".*"
 
 	# valid command
-	send "experimental-mode on; del server test/s1"
+	send "del server test/s1"
 	expect ~ "Server deleted."
-	send "experimental-mode on; del server test/s2"
+	send "del server test/s2"
 	expect ~ "Server deleted."
-	send "experimental-mode on; del server test/s3"
+	send "del server test/s3"
 	expect ~ "Server deleted."
 }
 
@@ -95,7 +95,7 @@
 }
 
 haproxy h1 -cli {
-	send "experimental-mode on; add server test/s1 ${tmpdir}/ssl.sock ssl verify none crt ${testdir}/client1.pem"
+	send "add server test/s1 ${tmpdir}/ssl.sock ssl verify none crt ${testdir}/client1.pem"
 	expect ~ "New server registered."
 	send "enable server test/s1"
 	expect ~ ".*"