Update bash_completion to not use a temp file

bash_completion

Index: bash_completion
diff --git a/bash_completion b/bash_completion
index 6a3077c64a61e92ce26846074416d908fcd44faa..bc9988aaceaa1ee45bac46ea9294f6114f2cd91e 100644
--- a/bash_completion
+++ b/bash_completion
@@ -200,10 +200,9 @@ _list_repo_branches() {
 
 _list_repo_projects() {
   local repo=${COMP_WORDS[0]}
-  local manifest=$(mktemp)
-  "$repo" manifest -o "$manifest" >& /dev/null
-  grep 'project name=' "$manifest" | sed 's/.\+name="\([^"]\+\)".\+/\1/'
-  rm -f "$manifest" >& /dev/null
+  "$repo" manifest -o /dev/stdout 2> /dev/null \
+    | grep 'project name=' \
+    | sed 's/.\+name="\([^"]\+\)".\+/\1/'
 }
 
 # Complete repo's <command> argument.