Fix sorting on LC_ALL=C platforms

We made assumptions on the platform for sorting purposes, which turned
out to break with new images being deployed. Explicitly setting LC_ALL
should make this work.

Change-Id: Id65f1bff8e38c777fa406d88ac6a2355d6033d94

Author: sdague

tests/test_package_ordering.sh

@@ -7,6 +7,7 @@ TOP=$(cd $(dirname "$0")/.. && pwd)
 
 source $TOP/tests/unittest.sh
 
+export LC_ALL=en_US.UTF-8
 PKG_FILES=$(find $TOP/files/debs $TOP/files/rpms $TOP/files/rpms-suse -type f)
 
 TMPDIR=$(mktemp -d)