Allow for installation from a shared/exported directory

[pmoosh]

Implement an option, that allows for an installation from a shared/exported directory instead of unzipping the downloaded files on the VM/system. It would reduce the space needed for the installation.

[aririikonen]

For v2.0.0 we'll be adding a check on the node[:oracle][:rdbms][:install_dir] directory, if the directory exists (e.g. /opt/oracle/install_dir/database) and there is already files under it. Then the fetching and unzipping of the filed will be skipped. Same functionality will be added for the patches, so node[:oracle][:rdbms][:latest_patch][:dirname].

[pmoosh]

+1