AM-101 : Fix the behavior of archives download
* --no-cache has no effect on it
* The add-ons manager always retry to download the archive from the downloadUrl. The download is skipped if the local file exists, it has the same size as the remote one and its modifiedDate is > to the remote one (It will allow to install new SNAPSHOTs without enforcing to download the archive each time)
* The same behavior is applied for all URLs (http(s), file)
Add tests for --offline and fix messages (AM_INST_13)
Do not display logs for commands not involved in the test