Allowed implementation of HostSelectionPolicy outside the gocql pkg #1754
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This PR allows implementation of
HostSelectionPolicyinterface outside the gocql package.Also, it adds
NewHostInfoconstructor for testing purposes. We need this becauseHostSelectionPolicy,HostFilter, and other options of ClusterConfig are presented as a public interface so they may be implemented outside the gocql package. But those custom implementations cannot be tested, because all fields ofHostInfoare private and protected from concurrent changes by mutex.closes #1759