t5305: simplify packname handling
We generate a series of packfiles test-1-$pack, test-2-$pack, with different properties and then examine them. However we always store the packname generated by pack-objects in the variable packname_1. This probably was meant to be packname_2 in the second test, but it turns out that it doesn't matter: once we are done with the first pack, we can just keep using the same $packname variable. So let's drop the confusing "_1" parameter. At the same time, let's give test-1 and test-2 more descriptive names, which can help keep them straight (note that we _could_ likewise overwrite the packfiles in each test, but by using separate filenames, we are sure that test 2 does not accidentally use the packfile from test 1). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>