cmd/run: detect simulation errors and exit with appropriate rc

[kmroz]

Something along these lines:

$ ./flightsim run imposter
[...]
05:54:16 [imposter] Done (5/5)

All done! Check your SIEM for alerts using the timestamps and details above.
$ echo $?
0


$ ./flightsim run -iface lo0 imposter
[...]
05:54:21 [imposter] Resolving random imposter domains
05:54:22 [imposter] Resolving office365.com-edge2-cdn.net
05:54:22 [imposter] ERROR: office365.com-edge2-cdn.net: lookup office365.com-edge2-cdn.net. on 192.168.1.1:53: write udp 127.0.0.1:54473->192.168.1.1:53: write: can't assign requested address
[...]
05:54:26 [imposter] Done (0/5)

All done, but simulation errors ocurred! Check your SIEM for alerts using the timestamps and details above.
The following simulations experienced errors: imposter
$ echo $?
1


$ ./flightsim run imposter
[...]
06:08:53 [imposter] Resolving random imposter domains
06:08:54 [imposter] Resolving office365.com-edge2-cdn.net
06:08:54 [imposter] ERROR: office365.com-edge2-cdn.net: TEST ERROR
[...]
06:08:58 [imposter] Done (4/5)

All done, but simulation errors ocurred! Check your SIEM for alerts using the timestamps and details above.
The following simulations experienced errors: imposter
$ echo $?
1


$ ./flightsim run -iface lo0 tunnel-icmp
[...]
06:02:40 [tunnel-icmp] FATAL: Couldn't start the module: listen ip4:icmp 127.0.0.1: socket: operation not permitted (make sure you have sufficient network privileges or try to run as root)

All done, but simulation errors ocurred! Check your SIEM for alerts using the timestamps and details above.
The following simulations experienced errors: tunnel-icmp
$ echo $?
1


$ ./flightsim run -iface lo0 -fast
[...]

All done, but simulation errors ocurred! Check your SIEM for alerts using the timestamps and details above.
The following simulations experienced errors: c2, dga, imposter, miner, scan, sink, spambot, ssh-exfil, ssh-transfer, tunnel-dns, tunnel-icmp
$ echo $?
1