Removing memberType from mcastGroupSource & sourceType from mcastGrou…

[suhaniladani]

Conform with the contract test v2 rules

Since these resource TgwMcastGroupSource & TgwMcastGroupMember are based on a common resource TgwMcastGroup, each resource has some properties which may not be necessarily displayed in each read request based on the resource type (Member or Source). But according to the contract test v2, each readOnly property needs to be displayed in the readRequest. Making the following changes to conform with the contract test consistency standards.

Issue #, if available:
This is still not complete set of changes to make the contract test v2 fully work. Next steps:

• Add integ test for List resources in integ test package
• Ask CFN for exception from the ListResources Tests.

Description of changes:

• Removing the property sourceType from under readOnly properties in mcastGroupMember to conform with the contract test v2 rules.
• Removing the property memberType from under readOnly properties in mcastGroupSource to conform with the contract test v2 rules.

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