go: update go 1.9 -> go 1.10

go: update go 1.9 -> go 1.10

* Patches and recipes reworked for go 1.10's significant
  changes to its bootstrap and build steps.

* Update go1.4 source tarball used for go-native
  bootstrapping to the version recommended
  in the current go documentation

* Remove test data from installed sources to eliminate
  some packaging QA warnings

* Set GOCACHE to 'off' to disable 1.10's build caching
  in the go recipes and bbclass

* Update go_do_compile to compile both static and
  dynamic objects dynamic linking is in use, since
  go1.10's build tool is pickier about this

Signed-off-by: Matt Madison <matt@madison.systems>
Signed-off-by: Ross Burton <ross.burton@intel.com>