git policy

[Dominick Grift]

I was browsing git policy and noticed this

 optional_policy(`
 	apache_content_template(git)
-	git_read_session_content_files(httpd_git_script_t)
+	git_read_all_content_files(httpd_git_script_t)
 	files_dontaudit_getattr_tmp_dirs(httpd_git_script_t)
 ')

Allow httpd git scripts to read git system and git user content. That way cgit or gitweb
can display both: all system repositories in /var/lib/git as well as all user repositories
in /home/*/public_git.