Remove unused shell script

the file is not used anywhere, nor is the findtestfiles() function
defined inside of it.

tests/lib/testlib.sh

@@ -1,37 +0,0 @@
-#!/bin/sh
-# Shell functions for use by anaconda tests
-#
-# Copyright (C) 2014  Red Hat, Inc.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU Lesser General Public License as published
-# by the Free Software Foundation; either version 2.1 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-# Author: David Shea <dshea@redhat.com>
-
-# Print a list of files to test on stdout
-# Takes filter arguments identical to the find utility, for example
-# findtestfiles -name '*.py'. Note that pruning directories will not
-# work since find is passed a list of filenames as the path arguments.
-findtestfiles()
-{
-    # If the test is being run from a git work tree, use a list of all files
-    # known to git
-    if [ -d "${top_srcdir}/.git" ]; then
-        findpath=$(git ls-files -c "${top_srcdir}")
-    # Otherwise list everything under $top_srcdir
-    else
-        findpath="${top_srcdir} -type f"
-    fi
-
-    find $findpath "$@"
-}