Bad param escaping and extra parenthesis fix

Yes, the parentheses definitely looks wrong -- I"m not sure how that made it in there. However, why the escaped backslash before the escaped double-quote character? Does this string end up being parsed a second time somewhere -- i.e. " \\\" " -> " \" " => "

Looked at another way, if we swap " with ', shouldn't the result be 'context="system_u:object_r:glance_var_lib_t:s0"' without the extra backslashes?