Modify tests to reflect different URL encoding for single quote

Single quotes in query parameters in HttpURLConnection changed
behavior between M and N due to upstream changes in OkHttp:
in N, single quotes started being encoded as %27 when present in
query parameters. Unfortunately, this broke several "iTunes remote"
apps: iTunes appears not to support %27 encoding for single quotes
in its DAAP server.

Bug: 30405333
Test: (old) cts test packages android.core.tests.libcore.package.okhttp
    and android.core.tests.libcore.package.libcore
Change-Id: Id87da28529098f639d3be6aed0626d5e3996739d