Rename --runtool and --runtool-arg

This renames `--runtool` and `--runtool-arg` to `--test-runtool` and
`--test-runtool-arg` to maintain consistency with other `--test-*`
arguments.

tests/run-make/doctests-runtool/rmake.rs

@@ -1,4 +1,4 @@
-// Tests behavior of rustdoc `--runtool`.
+// Tests behavior of rustdoc `--test-runtool`.
 
 use std::path::PathBuf;
 
@@ -11,7 +11,7 @@ fn mkdir(name: &str) -> PathBuf {
     dir
 }
 
-// Behavior with --runtool with relative paths and --test-run-directory.
+// Behavior with --test-runtool with relative paths and --test-run-directory.
 fn main() {
     let run_dir_name = "rundir";
     let run_dir = mkdir(run_dir_name);
@@ -27,7 +27,7 @@ fn main() {
         .arg("--test")
         .arg("--test-run-directory")
         .arg(run_dir_name)
-        .arg("--runtool")
+        .arg("--test-runtool")
         .arg(&run_tool_binary)
         .extern_("t", "libt.rlib")
         .run();

tests/run-make/rustdoc-default-output/output-default.stdout

@@ -141,9 +141,9 @@ Options:
         --enable-per-target-ignores 
                         parse ignore-foo for ignoring doctests on a per-target
                         basis
-        --runtool The tool to run tests with when building for a different target than host
+        --test-runtool The tool to run tests with when building for a different target than host
                         
-        --runtool-arg One (of possibly many) arguments to pass to the runtool
+        --test-runtool-arg One (of possibly many) arguments to pass to the runtool
                         
         --test-builder PATH
                         The rustc-like binary to use as the test builder

tests/rustdoc/doctest/doctest-runtool.rs

@@ -1,10 +1,10 @@
-// Tests that the --runtool argument works.
+// Tests that the --test-runtool argument works.
 
 //@ ignore-cross-compile
 //@ aux-bin: doctest-runtool.rs
 //@ compile-flags: --test
-//@ compile-flags: --runtool=auxiliary/bin/doctest-runtool
-//@ compile-flags: --runtool-arg=arg1 --runtool-arg
+//@ compile-flags: --test-runtool=auxiliary/bin/doctest-runtool
+//@ compile-flags: --test-runtool-arg=arg1 --test-runtool-arg
 //@ compile-flags: 'arg2 with space'
 //@ compile-flags: -Zunstable-options