Packages::DoSearchContents: Avoid breaking the grep pipe

Packages::DoSearchContents: Avoid breaking the grep pipe

Since grep doesn't handle SIGPIPE in any sane way but instead
clutters the error.log with useless comments like
"grep: writing output: Broken pipe" for each and every line it
wants to write, lets make it happy and read all the stuff in even
if we don't use it.