branch=main - a portscan kills epmd

[elsbiet]

a portscan

nmap -p 4000-5000 10.28.57.95

kills epmd (andalso telnet ip 4369 and probably other programs)

(12526) otp_socket: Unable to accept on socket 54.  errno=128
CRASH
======
pid: <0.8.0>

Stacktrace:
[{epmd,accept,1,[{file,"../AtomVM/libs/eavmlib/src/epmd.erl"},{line,128}]},{epmd,handle_info,2,[{file,"../AtomVM/libs/eavmlib/src/epmd.erl"},{line,99}]},{gen_server,loop,3,[{file,"../AtomVM/libs/estdlib/src/gen_server.erl"},{line,556}]}]

cp: #CP<module: 17, label: 27, offset: 20>

x[0]: error
x[1]: {case_clause,{error,enotconn}}
x[2]: {3,3,114,2,[{4,3337},{17,333},{17,945}],error}

Stack 
-----

{state,{<<"">>,#Ref<0.0.7>},4369,#Ref<0.0.22>,[{#Ref<0.0.20>,client}],[{<<"atomvm">>,53195,#Ref<0.0.20>,<<207,203,77,0,0,6,0,6,0,6,97,116,111,109,118,109,0,0>>}],43}
#CP<module: 17, label: 15, offset: 40>
#CP<module: 4, label: 115, offset: 21>
[]
[]
[]
{state,{<<"">>,#Ref<0.0.7>},4369,#Ref<0.0.22>,[{#Ref<0.0.20>,client}],[{<<"atomvm">>,53195,#Ref<0.0.20>,<<207,203,77,0,0,6,0,6,0,6,97,116,111,109,118,109,0,0>>}],43}
[]
{state,epmd,epmd,{state,{<<"">>,#Ref<0.0.7>},4369,#Ref<0.0.22>,[{#Ref<0.0.20>,client}],[{<<"atomvm">>,53195,#Ref<0.0.20>,<<207,203,77,0,0,6,0,6,0,6,97,116,111,109,118,109,0,0>>}],43}}
<0.1.0>
#CP<module: 4, label: 140, offset: 0>

Mailbox
-------


Monitors
--------
link to <0.1.0>
monitored by resource 0x3fcc06ac ref=9
monitored by resource 0x3fcc4c60 ref=21


**End Of Crash Report**
Return value: 1000
I (12636) AtomVM: AtomVM application terminated.  Going to sleep forever ...

[pguyot]

I believe there might be an issue in the supervision tree or strategy.