Bugfix: Address issues in android-keystore tool

[priitlatt]

This is a bugfix PR to address issues that slipped through with android-keystore tool release.

The issues were:

• Action android-keystore create-debug-keysotre did not work since it called create method with invalid keyword argument.
• Argument --keystore was not required for actions android-keystore create and android-keystore verify which potentially caused unexpected failures when invoking those actions.
• When trying to verify non-keystore file as a keystore the shown error message contained Java classpaths and was misleading. The error is now more self-explanatory.

Affected actions:

• android-keystore create,
• android-keystore create-debug-keystore,
• android-keystore verify.