[SQUASH ME] sixlowpan.tests.framework: fix rebase errors
[SQUASH ME] sixlowpan.iphc_cbuf.tests.framework: fix rebase errors
[SQUASH ME] sixlowpan.hc: fixes
[SQUASH ME] sixlowpan.tests: error fixes to framework
[SQUASH ME] sixlowpan.tests: continue hc testing
[SQUASH ME] sixlowpan.tests: hc test coding style