Fix deadlock caused by net_kernel:setopts(new, _)

[rickard-green]

A call to net_kernel:setopts(new, Opts) at the same time as a connection was being set up could cause a deadlock between the net_kernel process and the process setting up the connection.

Fixes #6129

[github-actions[bot]]

CT Test Results

       2 files       65 suites   53m 14s :stopwatch: 1 321 tests 1 181 :heavy_check_mark: 140 :zzz: 0 :x: 1 476 runs  1 305 :heavy_check_mark: 171 :zzz: 0 :x:

Results for commit 1db67afd.

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