The test_server application has previously been deprecated.

In OTP 19, we will move relevant parts of test_server into the
common_test application. Test suites that include test_server.hrl
must be updated to include ct.hrl instead. Test suites that include
test_server_line.hrl must removed that inclusion. Test suites that
call the test_server module directly will continue to work in OTP 19.

The test suites for Erlang/OTP are built and executed in exactly
the same way as previously.

Here are some more details.

The modules test_server*.erl and erl2html2.erl in lib/test_server/src
have been moved to common_test/src.

The test_server.hrl and test_server_line.hrl include files have
been deleted. The macros in test_server.hrl have been copied into
lib/common_test/include/ct.hrl.

The ts*.erl modules and their associated data files in
lib/test_server/src has been been moved to the new directory
lib/common_test/test_server. The ts* modules are no longer built
to lib/common_test/ebin. They will only built when 'make release_tests'
is executed.

The test suite for test_server has been moved to lib/common_test/test.

The rest of the files have been deleted.

Since no test suites includede test_server.hrl, there is no need
to have test_server in the include path or code path.

Conflicts:
	OTP_VERSION
	erts/vsn.mk
	lib/test_server/src/erl2html2.erl

OTP-12704

OTP-12704

This is a library module for testing release related functionality in
one or more applications. The first version of ct_release_tests
include test of upgrade only.

Note that the hipe application does not support any upgrade, and typer
and dialyzer requires hipe, so these three applications are always
exluded from the test.