api/reboot: Skip building tests on ppc64

An apparent gccgo linking bug prevents the tests from building on
ppc64. Just avoid building the test file for now.

Also adds missing copyright headers.
Merge pull request #915 from bz2/ppc64_skip_test_build_1381671

api/reboot: Skip building tests on ppc64

An apparent gccgo linking bug prevents the tests from building on
ppc64. Just avoid building the test file for now.

Also adds missing copyright headers.

http://reviews.vapour.ws/r/176/