CHIA-1645: Some daemon start cleanup

[emlowe]

Change the daemon startup procedure:

• During start, the daemon no longer outputs some JSON on stdout. This was previously read by the GUI (although it's not known how long it was used) - but hasn't been read since earlier this year (see Remove unused code that attempts to read the output of the daemon chia-blockchain-gui#2526) when the GUI startup was changed to use chia start daemon
• The daemon is launched with setting stdout,stderr,stdin to DEVNULL and with start_new_session
• Code was added to stop trying to read the daemon stdout as a mechanism to wait for the daemon to be ready and code added to retry to connect to the socket

This seems to work well so far in my testing and I believe this will fix both #18677 and #16396

I tested launching the daemon in a variety of ways including

• chia start daemon
• chia run_daemon
• chia_daemon

So far testing was limited to macOS and Linux, Windows needs some additional testing.

[emlowe]

close and reopen

[arvidn]

looks good! If anything, I would suggest making it mandatory to name the wait_for_start argument. but it's fine either way

[coveralls-official]

Pull Request Test Coverage Report for Build 11805186875

Details

• 14 of 18 (77.78%) changed or added relevant lines in 3 files are covered.
• 44 unchanged lines in 11 files lost coverage.
• Overall coverage decreased (-0.2%) to 90.722%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
chia/cmds/start_funcs.py	0	2	0.0%
chia/daemon/client.py	13	15	86.67%

Files with Coverage Reduction	New Missed Lines	%
chia/timelord/timelord.py	1	80.0%
chia/_tests/simulation/test_simulation.py	1	96.45%
chia/daemon/keychain_proxy.py	1	74.58%
chia/full_node/full_node_api.py	1	82.27%
chia/farmer/farmer.py	1	72.52%
chia/plotters/madmax.py	1	50.6%
chia/daemon/client.py	1	74.01%
chia/timelord/timelord_launcher.py	2	89.29%
chia/server/ws_connection.py	4	88.06%
chia/full_node/full_node.py	10	86.08%

Totals
Change from base Build 11804208692:	-0.2%
Covered Lines:	87097
Relevant Lines:	95827

---

💛 - Coveralls

[github-actions]

File	Coverage	Missing Lines
chia/cmds/start_funcs.py	0.0%	lines 53-54
chia/daemon/client.py	86.7%	lines 57-58

Total	Missing	Coverage
18 lines	4 lines	77%