remove extra build stuff from externalproject

the CI build already has all of these things in the docker root, so
there is no reason to build them via cmake externalproject.

Also, phosphor-logging doesn't play well with gtest, so remove it in
place of std::cerr

Change-Id: I742a3174eda19f62f80f1d13a314fadd7e6414df
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
3 files changed