Allow archives to be installed without extraction

Use of 'extract_archive: yes/no' parameter in package configuration
allows adding of archives (7z, tar.gz, etc.) to components as is, without
extracting it first. If the parameter is not found, the default step
is to always extract the archive.

Change-Id: If5de57fcdc35ef0871b0702408ecf864c89109e1
Reviewed-by: Antti Kokko <antti.kokko@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>