Re-registering a schema should not resolve other schemas

When an infinispan user adds a new proto schema to the proto metadata cache, SerializationContextRegistryImpl.MarshallerContext.update() re-registers all the schemas and marshallers.

If one of the already-registered schemas is invalid (e.g. because its dependencies are going to be registered later), the re-registration of common-types-java.proto fails:

org.infinispan.protostream.DescriptorParserException: Import 'B.proto' not found
	at org.infinispan.protostream.descriptors.FileDescriptor.resolveImports(FileDescriptor.java:291)
	at org.infinispan.protostream.descriptors.FileDescriptor.resolveDependencies(FileDescriptor.java:229)
	at org.infinispan.protostream.descriptors.FileDescriptor.resolveDependencies(FileDescriptor.java:210)
	at org.infinispan.protostream.descriptors.ResolutionContext.resolve(ResolutionContext.java:57)
	at org.infinispan.protostream.impl.SerializationContextImpl.registerProtoFiles(SerializationContextImpl.java:127)
	at org.infinispan.protostream.types.java.CommonTypesSchema.registerSchema(CommonTypesSchema.java:49)

The immediate source of the problem is that CommonTypesSchema.registerSchema() creates a new FileDescriptorSource instance, which doesn't have a ProgressCallback. On the other end of the problem, I don't think adding a new schema in a SerializationContextImpl should re-register the existing schemas.

But I also believe that registering a schema should not automatically try to resolve all the other schemas, resolving the schemas should be a separate step at the end of the SerializationContextRegistryImpl update.