TED update - 20: adding new TE-Link switching-capability index

Added new #indexing on the #TE-Link #based on the #switching-type and #lsp-encoding-type in the TED module. This will enable to #look-up TE-Link based on the #switching-capability-descriptors available on the link. This will be useful when computing #path for #LSPs of specific #switching-type and #encoding-type. The switching-capability-descriptor of a TE-Link is #derived from it's underlying #component #links. This enables to create #TE-Links #over higher capacity #server-layers e.g. #Ethernet capable TE-Links created over #SDH / #OTN server-layers.

#TED update 20 ...
[commit 4719c883875c413d03d3f37ec04933399fd52ff4] (https://github.com/nes-repo/NES-Open-Switch/commit/4719c883875c413d03d3f37ec04933399fd52ff4)