Remove the random() stubs from the codebase

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Use the same config mechanism for ro_vars as for sys_config, get rid of a bunch of custom code.

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Which disables tokenizer, parser, AST, and compiler. On ESP8266, it
frees 21K of ROM.

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So that socket/connection/whatever is really closed by the time user code is run.

Speed up test_http_endpoints by using appropriate wait conditions.

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That don't have CONSOLE_UART defined

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Do not use CA bundle on CC3200, it doesn't work.
Make ssl_ca_cert = "*" mean "no verification" and make sure
SSL is enabled on the connection when it's required, even w/o verification.

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Newlib implements rename as _link and _unlink, not _rename.
There is no _link on either SLFS or SPIFFS, so override rename directly.

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!): Fix for compile error in Android.

Remember sorting settings in url fragment, reverse order on repeated
header click.

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SimpleLink restart invalidates all sockets.
Listeners are restarted, outgoing connections are closed.

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cesanta/mongoose#677

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Domain name verification feature was added in NWP service pack
(reported version: 2.6.0.5). Older versions do not support it.
There's not much we can do about it, so we just ignore the error.

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Frees up ~19KB RAM:

Before:
  Code size: 210616
  RAM at startup: 48636 total, 34472 free
  RAM after sys init: 15024 free

After:
  Code size: 195784
  RAM at startup: 65096 total, 52980 free
  RAM after sys init: 34116 free

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