The `-i` flag causes a problem when a cross compilation happens because
it attempts to build files in GOROOT which is located in a directory
that is not writable by the build user. This same problem exists for
when the `-tags` are changed like adding `-tags assets` in the `all`
build that runs on the master branch.
This removes `-i` because, in the latest go release, the `-i` flag
doesn't actually do anything useful since there is another build cache
that the results are placed in regardless of whether `-i` is used.
This fixes the build on master so that `make all` and `make nightly`
will function properly.
This updates the dependency manager to use go modules instead of dep so
that we can remove dep as a dependency and we can begin using and giving
feedback on modules within this project. It should simplify dependency
management and make it faster to run the builds too.
The big change is updating the various Makefiles to stop relying on the
vendor directory because it no longer exists. This change creates a
`tools.go` file with the revisions of the tools we use that are currently
in the `required` section of `Gopkg.toml`. We are currently in other
discussions to modify how we handle tool dependency management, but this
change does not change that.
Jonathan A. Sternberg
Stuart Carnie
Christopher Wolff
Nathaniel Cook