ts Make the e1inp_ts delay configurable

Currently the nanoBTS bootstrap code requires a high delay
otherwise we are not bringing the device up properly. Changing
the init code turns out harder than it seems like. So this is
a workaround for that to allow a high speed RSL/OML connection
after the bringup.

The line driver can have a default TS delay. It is set to the
current default for the nanoBTS and the BS11. For the ipaccess
case we will set the delay lower for the RSL connection and
inside the ipaccess-config we can set it low right away to
have fast firmware flashing and such.
diff --git a/openbsc/src/e1_input.c b/openbsc/src/e1_input.c
index 9b205b7..f7d69c5 100644
--- a/openbsc/src/e1_input.c
+++ b/openbsc/src/e1_input.c
@@ -303,6 +303,10 @@
 
 	switch (type) {
 	case E1INP_TS_TYPE_SIGN:
+		if (line->driver)
+			ts->sign.delay = line->driver->default_delay;
+		else
+			ts->sign.delay = 100000;
 		INIT_LLIST_HEAD(&ts->sign.sign_links);
 		break;
 	case E1INP_TS_TYPE_TRAU: