Use the exported env variable for nopackages.

Now that smithy exports a variable saying what
packages conflict we can just use that instead
of having to have the same duplicate info in
the distro yaml file.

Change-Id: Ia5818f8d8866472ab6968e69db4fa91aaf188894
Don't delete the dep files on uninstall.

Instead of removing those files on uninstall
remove them only when we actually run the
remove action which will invoke a new destroy
method.

Change-Id: Ifff0229412b5bfaff4900ff15a9b4f7716bad928
Merge "Use the exported env variable for nopackages."