Integrate cddl/usr.sbin/zfds/tests into the FreeBSD test suite

[ngie]

Summary

This change integrates the unit tests for zfsd into the test suite using the
integration method described in D19551.

This change removes the LOCALBASE includes added for the port version of
googlemock/googletest, as well as unnecessary LIBADD/DPADD and CXXFLAGS
defines, which are included in the GTEST_CXXFLAGS variable, as part of
D19551.

Test Plan

$ kyua test -k /usr/tests/cddl/usr.sbin/zfsd/Kyuafile
zfsd_unittest:main  ->  passed  [0.024s]

Results file id is usr_tests_cddl_usr.sbin_zfsd.20190312-000329-993750
Results saved to /home/ngie/.kyua/store/results.usr_tests_cddl_usr.sbin_zfsd.20190312-000329-993750.db

1/1 passed (0 failed)

The full results from Kyua can be found
here.

[ngie]

Fix a build break with mips*/powerpc* as they lack C++11 capable compilers and
would fail to build the zfsd tests with g++ 4.2.1.

[emaste]

Mentor approved