rspro_client_fsm: Disable automatic connect on FSM allocation

So far, the rspor_client_fsm immediately attempted to establish a
TCP connection to the RSPRO server when calling server_conn_fsm_alloc().

Let's make this implicit auto-connect an explicit request to connect
using the newly-introduced SRVC_E_ESTABLISH.

Let's also change all three existing users of server_conn_fsm_alloc()
to send SRVC_E_ESTABLISH after calling it.

The rationale of this change is to use the same rspro_client_fsm also
for the client->bankd RSPRO connection, where we don't want to
automatically connect at startup, but connect only at a later point, after the
server a has told us to do so.

Change-Id: Icd882405f2ef54e10a66054829c089e4985f1d1f
diff --git a/src/bankd/bankd_main.c b/src/bankd/bankd_main.c
index a204be5..194baef 100644
--- a/src/bankd/bankd_main.c
+++ b/src/bankd/bankd_main.c
@@ -363,6 +363,7 @@
 		fprintf(stderr, "Unable to create Server conn FSM: %s\n", strerror(errno));
 		exit(1);
 	}
+	osmo_fsm_inst_dispatch(srvc->fi, SRVC_E_ESTABLISH, NULL);
 
 	/* create listening socket for inbound client connections */
 	rc = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP, g_bind_ip, g_bind_port, OSMO_SOCK_F_BIND);