Graphical config module does not print opkg operations during dry-run; inconsistent behavior.

[amstewart]

Most of the Config modules perform opkg_helper operations during --dry-run conditions, and rely on the opkg_helper._dry_run attribute to suppress filesystem changes. Instead, opkg will print the operation and move on.

But the _GraphicalConfig behaves differently, and instead bails out of configure() early, when in dry-run conditions.

The _Graphical Config should behave the same as the other configs, for consistency.

Related: #45

[texasaggie97]

Several of the config classes do this so they should all be updated for this.