Add fmt script to admin dir

.gitignore

@@ -4,3 +4,4 @@ target/
 *.gcno
 *.info
 sslkeylogfile.txt
+admin/rustfmt

Cargo.toml

@@ -5,3 +5,4 @@ members = [
   # tests and example code that depend on mio
   "rustls-mio",
 ]
+exclude = ["admin/rustfmt"]

admin/fmt

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -xe
+
+ADMIN=$(dirname "$0")
+PREV=$(pwd)
+if [ ! -d $ADMIN/rustfmt ] ; then
+  git clone --depth 1 https://github.com/rust-lang/rustfmt $ADMIN/rustfmt
+fi
+
+if [ ! -x $ADMIN/rustfmt/target/release/cargo-fmt ] ; then
+  cd $ADMIN/rustfmt
+  export CFG_RELEASE=nightly
+  export CFG_RELEASE_CHANNEL=nightly
+  cargo build --release --features rustfmt,cargo-fmt
+fi
+
+cd $PREV
+PATH=$ADMIN/rustfmt/release/:$PATH cargo-fmt