Merge branch 'bw/grep-recurse-submodules'

"git grep --recurse-submodules" has been reworked to give a more
consistent output across submodule boundary (and do its thing
without having to fork a separate process).

* bw/grep-recurse-submodules:
  grep: recurse in-process using 'struct repository'
  submodule: merge repo_read_gitmodules and gitmodules_config
  submodule: check for unmerged .gitmodules outside of config parsing
  submodule: check for unstaged .gitmodules outside of config parsing
  submodule: remove fetch.recursesubmodules from submodule-config parsing
  submodule: remove submodule.fetchjobs from submodule-config parsing
  config: add config_from_gitmodules
  cache.h: add GITMODULES_FILE macro
  repository: have the_repository use the_index
  repo_read_index: don't discard the index

submodule-config.c

@@ -254,6 +254,14 @@ static int parse_fetch_recurse(const char *opt, const char *arg,
 	}
 }
 
+int parse_submodule_fetchjobs(const char *var, const char *value)
+{
+	int fetchjobs = git_config_int(var, value);
+	if (fetchjobs < 0)
+		die(_("negative values not allowed for submodule.fetchjobs"));
+	return fetchjobs;
+}
+
 int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
 {
 	return parse_fetch_recurse(opt, arg, 1);