VaultDistrubtionPackageBuilderFactory mixed up ordering of attribute definition for type

The VaultDistributionPackageBuilderFactory's AttributeDefintion [0] for "type" has the label and values swapped. 

The impact is that someone creating an OSGi configuration that uses the value of "in memory packages" will not have in memory packages created as the "label" is what is used to check if packages should be created in memory [1].

The OSGi docs for Option [2] identify the label as being a human readable string and the value should be the value.

At the same time fix the typo in the ObjectClassDefintion [3]

[0] https://github.com/apache/sling-org-apache-sling-distribution-core/blob/master/src/main/java/org/apache/sling/distribution/serialization/impl/vlt/VaultDistributionPackageBuilderFactory.java#L76-L80

 [1]https://github.com/apache/sling-org-apache-sling-distribution-core/blob/master/src/main/java/org/apache/sling/distribution/serialization/impl/vlt/VaultDistributionPackageBuilderFactory.java#L241

 [2] http://docs.osgi.org/javadoc/r6/cmpn/org/osgi/service/metatype/annotations/Option.html 

 [3] https://github.com/apache/sling-org-apache-sling-distribution-core/blob/master/src/main/java/org/apache/sling/distribution/serialization/impl/vlt/VaultDistributionPackageBuilderFactory.java#L71