doc: document lsp-mtu knob for IS-IS

[qlyoung]

We're missing docs on the knob used to specify the maximum LSP MTU.

Signed-off-by: Quentin Young qlyoung@cumulusnetworks.com

[LabN-CI]

💚 Basic BGPD CI results: SUCCESS, 0 tests failed

Results table

_	_
Result	SUCCESS git merge/5722 abd2a1f
Date	01/23/2020
Start	20:15:24
Finish	20:41:14
Run-Time	25:50
Total	1815
Pass	1815
Fail	0
Valgrind-Errors	0
Valgrind-Loss	0
Details	vncregress-2020-01-23-20:15:24.txt
Log	autoscript-2020-01-23-20:16:18.log.bz2
Memory	428 417 360
SUCCESS git merge/6183 83d98a8	SUCCESS git merge/5711 42a30c4
04/07/2020	01/20/2020
20:15:29	20:15:25
20:41:14	20:41:23
25:45	25:58
1815	1815
1815	1815
0	0
0	0
0	0
vncregress-2020-04-07-20:15:29.txt	vncregress-2020-01-20-20:15:25.txt
autoscript-2020-04-07-20:16:23.log.bz2	autoscript-2020-01-20-20:16:22.log.bz2
465 453 426	426 437 359

For details, please contact louberger

[NetDEF-CI]

Continuous Integration Result: SUCCESSFUL

Congratulations, this patch passed basic tests

Tested-by: NetDEF / OpenSourceRouting.org CI System

CI System Testrun URL: https://ci1.netdef.org/browse/FRR-FRRPULLREQ-11704/

This is a comment from an automated CI system.
For questions and feedback in regards to this CI system, please feel free to email
Martin Winter - mwinter (at) opensourcerouting.org.

Warnings Generated during build:

Debian 10 amd64 build: Successful with additional warnings

Debian Package lintian failed for Debian 10 amd64 build:
(see full package build log at https://ci1.netdef.org/browse/FRR-FRRPULLREQ-11704/artifact/DEB10BUILD/ErrorLog/log_lintian.txt)

W: frr source: pkg-js-tools-test-is-missing
W: frr source: newer-standards-version 4.4.1 (current is 4.3.0)
W: frr source: pkg-js-tools-test-is-missing
W: frr source: newer-standards-version 4.4.1 (current is 4.3.0)
W: frr-doc: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200408-00-g83d98a8b6-0 (missing) -> 7.4-dev-20200408-00-g83d98a8b6-0~deb10u1
W: frr-pythontools: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200408-00-g83d98a8b6-0 (missing) -> 7.4-dev-20200408-00-g83d98a8b6-0~deb10u1
W: frr-rpki-rtrlib: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200408-00-g83d98a8b6-0 (missing) -> 7.4-dev-20200408-00-g83d98a8b6-0~deb10u1
W: frr-snmp: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200408-00-g83d98a8b6-0 (missing) -> 7.4-dev-20200408-00-g83d98a8b6-0~deb10u1
W: frr: changelog-file-missing-explicit-entry 6.0-2 -> 7.4-dev-20200408-00-g83d98a8b6-0 (missing) -> 7.4-dev-20200408-00-g83d98a8b6-0~deb10u1

---

CLANG Static Analyzer Summary

• Github Pull Request 6183, comparing to Git base SHA 4ce8c00

No Changes in Static Analysis warnings compared to base

1 Static Analyzer issues remaining.

See details at
https://ci1.netdef.org/browse/FRR-FRRPULLREQ-11704/artifact/shared/static_analysis/index.html