shill: remove libshill-net-test library

Mock classes for libshill-net will exported through their respective
header files, so no need for the test library.

BUG=chromium:440637
TEST=USE="asan clang" FEATURES=test emerge-$BOARD shill apmanager
CQ-DEPEND=CL:234990

Change-Id: I03b828384e8e02661e6fc597126ec60c878baccf
Reviewed-on: https://chromium-review.googlesource.com/234991
Trybot-Ready: Peter Qiu <zqiu@chromium.org>
Tested-by: Peter Qiu <zqiu@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Paul Stewart <pstew@chromium.org>
Commit-Queue: Peter Qiu <zqiu@chromium.org>
1 file changed