don't HEAD downloads now that we are filtering out precise versions

src/resolve-go-version

@@ -44,21 +44,6 @@ if [ -z "$IGNORE_LOCAL_GO" ]; then
   done
 fi
 
-head_go_version="${head_go_version:-"./src/head-go-version"}"
-
-# if the exact version is available to download, use it
-if  "$head_go_version" "$GO_VERSION_CONSTRAINT" ; then
-  echo "$GO_VERSION_CONSTRAINT"
-  exit
-fi
-
-## if the exact version is available to download, use it
-#check_url="$(download_go_url "$GO_VERSION_CONSTRAINT")"
-#if curl -IL --fail -s "$check_url" >/dev/null; then
-#  echo "$GO_VERSION_CONSTRAINT"
-#  exit
-#fi
-
 if [ -z "$IGNORE_LOCAL_GO" ]; then
   set +e
   local_matches="$(echo "$local_versions" | "$action_dir/third_party/sh-semver/semver.sh" -r "$GO_VERSION_CONSTRAINT")"

src/resolve-go-version_test.sh

@@ -38,32 +38,13 @@ oneTimeSetUp() {
   done
 }
 
-available_head_versions=''
-
-mock_version_available_to_dl() {
-  v="$1"
-  for ver in $available_head_versions ; do
-      if [ "$ver" = "$v" ]; then
-        return 0
-      fi
-  done
-  return 1
-}
-
-mock_head_versions() {
-  export available_head_versions="$1"
-  export mock_head_go_version="1"
-}
-
 test_version() {
   export dl_json="$ex_dl_json"
   tmpdir="$SHUNIT_TMPDIR/${FUNCNAME[0]}"
   toolcache="$tmpdir/go"
   mkdir -p "$toolcache"
   touch "$toolcache/1.14.2"
   touch "$toolcache/1.15.6"
-  mock_head_versions '1.15
-1.15beta1'
 
   tests='*;1.15.6
 1.15;1.15
@@ -81,18 +62,13 @@ tip;tip
   done
 }
 
-
 test_version_ignore_local_go() {
   export dl_json="$ex_dl_json"
   tmpdir="$SHUNIT_TMPDIR/${FUNCNAME[0]}"
   toolcache="$tmpdir/go"
   mkdir -p "$toolcache"
   touch "$toolcache/1.14.2"
   touch "$toolcache/1.15.6"
-    mock_head_versions '1.15
-1.15beta1'
-
-  export version_available_to_dl_func="mock_version_available_to_dl"
 
   tests='*;1.15.7
 1.15;1.15