Default value for hello interval

[italobusi]

te/ietf-rsvp-extended.yang

Lines 162 to 173 in 692d392

	leaf hello-interval {
	type uint32;
	units "milliseconds";
	default "9000";
	description
	"Configure interval between successive Hello messages in
	milliseconds.";
	reference
	"RFC3209: RSVP-TE: Extensions to RSVP for LSP Tunnels.
	RFC5495: Description of the Resource Reservation Protocol -
	Traffic-Engineered (RSVP-TE) Graceful Restart Procedures.";
	}

There are implementations where the default value is 5000 ms

[tsaad-dev]

remove the default to make allow implementation to set their own.