autotools: First batch of fixes to do distcheck.

Signed-off-by: Michael Lippautz <michael.lippautz@gmail.com>
Adjust autotools to system gtest and fix tests.

Signed-off-by: Michael Lippautz <michael.lippautz@gmail.com>
autotools: Build from system gtest and not shipped one.

Signed-off-by: Michael Lippautz <michael.lippautz@gmail.com>
Get rid of shipped gtest.

Signed-off-by: Michael Lippautz <michael.lippautz@gmail.com>
README: Updae descriptions.

Signed-off-by: Michael Lippautz <michael.lippautz@gmail.com>