Godeps, vendor: convert dependency management to trash (#3198)

This commit converts the dependency management from Godeps to the vendor
folder, also switching the tool from godep to trash. Since the upstream tool
lacks a few features proposed via a few PRs, until those PRs are merged in
(if), use github.com/karalabe/trash.

You can update dependencies via trash --update.

All dependencies have been updated to their latest version.

Parts of the build system are reworked to drop old notions of Godeps and
invocation of the go vet command so that it doesn't run against the vendor
folder, as that will just blow up during vetting.

The conversion drops OpenCL (and hence GPU mining support) from ethash and our
codebase. The short reasoning is that there's noone to maintain and having
opencl libs in our deps messes up builds as go install ./... tries to build
them, failing with unsatisfied link errors for the C OpenCL deps.

golang.org/x/net/context is not vendored in. We expect it to be fetched by the
user (i.e. using go get). To keep ci.go builds reproducible the package is
"vendored" in build/_vendor.

build/ci.go

@@ -141,7 +141,6 @@ func doInstall(cmdline []string) {
 		log.Println("be compiled with an earlier version. Please upgrade your Go installation.")
 		os.Exit(1)
 	}
-
 	// Compile packages given as arguments, or everything if there are no arguments.
 	packages := []string{"./..."}
 	if flag.NArg() > 0 {
@@ -178,6 +177,7 @@ func goTool(subcmd string, args ...string) *exec.Cmd {
 	cmd := exec.Command(gocmd, subcmd)
 	cmd.Args = append(cmd.Args, args...)
 	cmd.Env = []string{
+		"GO15VENDOREXPERIMENT=1",
 		"GOPATH=" + build.GOPATH(),
 		"GOBIN=" + GOBIN,
 	}
@@ -200,11 +200,24 @@ func doTest(cmdline []string) {
 		coverage = flag.Bool("coverage", false, "Whether to record code coverage")
 	)
 	flag.CommandLine.Parse(cmdline)
+
 	packages := []string{"./..."}
 	if len(flag.CommandLine.Args()) > 0 {
 		packages = flag.CommandLine.Args()
 	}
-
+	if len(packages) == 1 && packages[0] == "./..." {
+		// Resolve ./... manually since go vet will fail on vendored stuff
+		out, err := goTool("list", "./...").CombinedOutput()
+		if err != nil {
+			log.Fatalf("package listing failed: %v\n%s", err, string(out))
+		}
+		packages = []string{}
+		for _, line := range strings.Split(string(out), "\n") {
+			if !strings.Contains(line, "vendor") {
+				packages = append(packages, strings.TrimSpace(line))
+			}
+		}
+	}
 	// Run analysis tools before the tests.
 	if *vet {
 		build.MustRun(goTool("vet", packages...))