fix PcpMmvWriter strings leak #127
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`PcpMmvWriter` leaks strings through its `PcpStringStore` when the writer is reset. The fix is to clear the store in the reset method. However, the `metricInfoStore` and `instanceDomainStore` rely on putting values in the string store when MMV2 is used. As such, these stores must also be cleared so that the strings can be recreated.
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PcpMmvWriterleaks strings through itsPcpStringStorewhen the writer is reset. The fix is to clear the store in the reset method. However, themetricInfoStoreandinstanceDomainStorerely on putting values in the string store when MMV2 is used. As such, these stores must also be cleared so that the strings can be recreated.Resolves #38