Increase endpoint timeout to 3840s

[Yoda-x]

needed for sleepy devices, see https://www.silabs.com/community/wireless/zigbee-and-thread/knowledge-base.entry.html/2012/06/29/how_long_can_my_end-jseP
fixes issues where battery driven devices stop working after 5min, because the ncp times them out

[coveralls]

Coverage remained the same at 100.0% when pulling d2304a0 on Yoda-x:clean-upstream into 4cf1237 on rcloran:master.

[coveralls]

Coverage remained the same at 100.0% when pulling b4aa183 on Yoda-x:clean-upstream into 4cf1237 on rcloran:master.

[coveralls]

Coverage remained the same at 100.0% when pulling d2304a0 on Yoda-x:clean-upstream into 4cf1237 on rcloran:master.

[coveralls]

Pull Request Test Coverage Report for Build 469

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 468:	0.0%
Covered Lines:	1315
Relevant Lines:	1315

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💛 - Coveralls