hyper_hello should be in its own crate (#2641)

So that "cargo build" will build it when the gn frontend is eventually
removed.

BUILD.gn

@@ -12,7 +12,7 @@ group("default") {
 }
 
 rust_executable("hyper_hello") {
-  source_root = "tools/hyper_hello.rs"
+  source_root = "tools/hyper_hello/hyper_hello.rs"
   extern_rlib = [
     "hyper",
     "ring",

Cargo.lock

@@ -450,6 +450,14 @@ dependencies = [
  "webpki-roots 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hyper_hello"
+version = "0.0.1"
+dependencies = [
+ "hyper 0.12.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ring 0.14.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "idna"
 version = "0.1.5"

Cargo.toml

@@ -2,4 +2,5 @@
 members = [
   "cli",
   "core",
+  "tools/hyper_hello",
 ]

tools/hyper_hello/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "hyper_hello"
+version = "0.0.1"
+
+[dependencies]
+hyper = "0.12.30"
+ring = "0.14.6"
+
+[[bin]]
+name = "hyper_hello"
+path = "hyper_hello.rs"