Solution: migrate to Unity

Solution: migrate to unity

Solution: Add IPv6 support

Solution: add unit tests

Solution: Factor the code into a different file with a well defined API and add
unit tests.

* always run tests from tarball of `make dist`

ensures that tests will not pass if critical files are omitted from releases

* add explicit make dist only for non-default builds

distcheck should already cover this for default builds

* don’t verify that valgrind/coverage tests can be run from dists

* add various files missing from dists

- missing template from cmake
- add missing android build files
- add some missing ci_build.sh scripts

Solution: migrate to unity

Solution: migrate to unity, merge into test_radio_dish, and split up test cases

Solution: migrate to unity

Solution: migrate to unity, and split test cases

Solution: migrate to unity, and split test cases

Solution: migrate to unity, and split test cases

Solution: migrate to unity, and split test cases

Solution: migrate to unity, and reduce code duplication

Solution: add appropriate definitions to build

Solution: migrate to unit and split up test cases

Solution: add unity dependencies/flags

Lets the application set per-connection metadata.
Metadata is specified as "X-key:value" and set using zmq_setsockopt, eg:
zmq_setsockopt (s, ZMQ_METADATA, "X-key:value", 11);

The peer can then obtain the metadata from a received message:
char *data = zmq_msg_gets(msg, "X-key");

Solution: migrate to unity

* Tests for different TIPC address types and code cleanup

* Adds tests for binding/connecting with different TIPC address types
  using Unity
* Adds error checking for address type misuse

Solution: add test_xpub_verbose to cover those APIs

Solution: add CODE_COVERAGE_*FLAGS to unit tests build

Fixes #2949

Solution: made mtrie generic (to remove complex dependency on pipe_t),
and added some unit tests

Solution: migrate test_sockopt_hwm to unity

Solution: add them to Makefile.am, linking to the static libzmq.a
library and its dependencies

Solution: add a noinst convenience static library and use it with the
tests that require it

Solution: port implementation from zproject

Solution: use the pkgconfig macro as the first step and then fallback
to manual checks

Solution: Don't unlink file on close

File may not belong to the socket at that point.

Solution: when a connection breaks and ZMQ_RECONNECT_IVL is set to -1,
which means a reconnection will not be attempted, send a message from
the I/O thread to the application thread to make the socket call
term_endpoint, which is the equivalent of manually calling
zmq_disconnect.
This way subsequent zmq_connect call to the same endpoint will attempt
again to do a connection.
Otherwise, for some socket types like SUBs, those new connects will
fail as the endpoint is recorded, despite the connection having been
permanently closed.

Add test cases to exercise this corner case with TCP and IPC.

Soluton: added tests

Solution: use it before falling back to headers checks

Solution: extracted common base class curve_mechanism_base_t

Solution: add testutil_security.hpp to Makefile.am

Solution: Move ZAP tests to own file test_security_zap.cpp, move common code to testutil_security.hpp

Solution: created a zap_client_t class, extracted first function send_zap_request from curve_server_t

Solution: add all the required compiler flags since the test includes
source code from the library directly