[android] improve the error logging when run from Android app sandbox without network permissions

[andrurogerz]

In order to debug an Android app, ds2 has to be run in the context of the app's sandbox. Since ds2 opens a TCP Socket, the app must have internet permissions declared in its manifest or ds2 cannot work.

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

When the app does not have these permissions, ds2 fails to launch with a misleading error message:

emu64xa:/ $ run-as com.example.app ./ds2 platform --server --listen localhost:6543
[6898][std::unique_ptr<Socket> CreateTCPSocket(const std::string &, const std::string &, bool)] FATAL  : cannot listen on [localhost:6543]: Success
[6898][void ds2::Utils::PrintBacktrace()] ERROR  : 0x00005e71c7a40dd7 <unknown>+0x5e71c7a40dd7 (/data/user/0/com.example.jniplayground/ds2+0xa9dd7)
[6898][void ds2::Utils::PrintBacktrace()] ERROR  : 0x00005e71c7a41b78 <unknown>+0x5e71c7a41b78 (/data/user/0/com.example.jniplayground/ds2+0xaab78)
[6898][void ds2::Utils::PrintBacktrace()] ERROR  : 0x00005e71c79f8158 <unknown>+0x5e71c79f8158 (/data/user/0/com.example.jniplayground/ds2+0x61158)
[6898][void ds2::Utils::PrintBacktrace()] ERROR  : 0x00005e71c79f8801 <unknown>+0x5e71c79f8801 (/data/user/0/com.example.jniplayground/ds2+0x61801)
[6898][void ds2::Utils::PrintBacktrace()] ERROR  : 0x00005e71c79f6dc9 <unknown>+0x5e71c79f6dc9 (/data/user/0/com.example.jniplayground/ds2+0x5fdc9)
[6898][void ds2::Utils::PrintBacktrace()] ERROR  : 0x0000786c986e8c63 __libc_init+0x73 (/apex/com.android.runtime/lib64/bionic/libc.so+0x57c63)
Aborted

We should improve this error message to clearly indicate the problem may be due to missing network permissions if being run on Android.