Add missing tests input files to distribution files

Add missing tests input files to distribution files

The runtestfedabipkgdiff.py test was missing some input files from the
source distribution.

This patch adds them back.

Also, the test file name
test-fedabipkgdiff/test6-missing-devel-debuginfo-nss-util-3.12.6-1.fc14.x86_64--nss-util-3.24.0-2.0.fc25.x86_64-report-0.txt
was too long for tar to handle so that file was left out of the final
source distribution tarball.  This patch renames that file to a
smaller name.

make distcheck should pass again now.

	* tests/data/Makefile.am: Add three missing test input files to
	the source distribution tarball.  Renamed
	test-fedabipkgdiff/test6-missing-devel-debuginfo-nss-util-3.12.6-1.fc14.x86_64--nss-util-3.24.0-2.0.fc25.x86_64-report-0.txt
	into
	test-fedabipkgdiff/test6-nss-util-3.12.6-1.fc14.x86_64--nss-util-3.24.0-2.0.fc25.x86_64-report-0.txt.
	* tests/runtestfedabipkgdiff.py.in (FEDABIPKGDIFF_TEST_SPECS):
	Renamed
	test6-missing-devel-debuginfo-nss-util-3.12.6-1.fc14.x86_64--nss-util-3.24.0-2.0.fc25.x86_64-report-0.txt
	into
	test6-nss-util-3.12.6-1.fc14.x86_64--nss-util-3.24.0-2.0.fc25.x86_64-report-0.txt.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>