rpmresolve: fix reporting of multiple matches error

rpmresolve: fix reporting of multiple matches error

We were mistakenly writing what was meant to go to stderr into the
output file, so when the "Multiple matches" error showed we weren't
actually seeing the matches printed.

Also change the wording of the "Unable to find package..." to "Unable
to resolve package..." instead so that it makes more sense if it is
printed after the "Multiple matches" error.

(From OE-Core rev: c26542eb4e8707b9639ec309a44809a728839db8)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>