zebra: CLI commands to display ethernet segments

zebra: CLI commands to display ethernet segments

1. ES sample display
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torm-11# show evpn es
Type: L local, R remote
ESI                            Type ES-IF                 VTEPs
00:00:00:00:00:00:00:00:00:00       -
03:00:00:00:00:01:11:00:00:01  LR   hostbond1             27.0.0.16
03:00:00:00:00:01:22:00:00:02  LR   hostbond2             27.0.0.16
03:00:00:00:00:01:22:00:00:03  LR   hostbond3             27.0.0.16
03:00:00:00:00:02:11:00:00:01  R    -                     27.0.0.17,27.0.0.18
03:00:00:00:00:02:22:00:00:02  R    -                     27.0.0.17,27.0.0.18
03:00:00:00:00:02:22:00:00:03  R    -                     27.0.0.17,27.0.0.18
torm-11#
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2. ES-EVI sample display
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torm-11# show evpn es-evi
Type: L local, R remote
VNI      ESI                            Type
1005     03:00:00:00:00:01:11:00:00:01  L
1005     03:00:00:00:00:01:22:00:00:02  L
1005     03:00:00:00:00:01:22:00:00:03  L
1002     03:00:00:00:00:01:11:00:00:01  L
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Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>