IS-IS SR-TE Advertise maximum link bandwidth and admin color without RSVP-TE configuration

Historically, Juniper devices required the Resource Reservation Protocol (RSVP) to be enabled in order to advertise traffic engineering attributes, such as maximum link bandwidth or admin-color. However, many features not related to RSVP, such as loop-free alternates (LFAs), policy-based LFA, or segment routing, might require these traffic engineering attributes as well. This forced the operator to enable RSVP, even in the deployments, where RSVP was not required. To decouple the RSVP configuration for the distribution of traffic engineering attributes, this feature introduces a new configuration, which relaxes the existing restriction traffic engineering attributes' advertisement when RSVP is not enabled. If you configure this new feature, IS-IS will advertise traffic engineering attributes using the advertisements as defined in RFC 5305, even when RSVP is not enabled.