replay tests should fetch PCAP data, but currently are skipping tests that rely on them

--- SKIP: TestOpCommandFromPcapFileLiveDB (0.00s)

 	pcap_test.go:194: pcap file mongoreplay/testPcap/op_command_2inserts.pcap not present, skipping test

 === RUN   TestWireCompression

 --- SKIP: TestWireCompression (0.00s)

 	pcap_test.go:194: pcap file mongoreplay/testPcap/compressed.pcap not present, skipping test

 === RUN   TestSingleChannelGetMoreLiveDB

 --- SKIP: TestSingleChannelGetMoreLiveDB (0.00s)

 	pcap_test.go:194: pcap file mongoreplay/testPcap/getmore_single_channel.pcap not present, skipping test

 === RUN   TestMultiChannelGetMoreLiveDB

 --- SKIP: TestMultiChannelGetMoreLiveDB (0.00s)

 	pcap_test.go:194: pcap file mongoreplay/testPcap/getmore_multi_channel.pcap not present, skipping test

 === RUN   TestRecordEOF

 --- SKIP: TestRecordEOF (0.00s)

 	pcap_test.go:134: pcap file testPcap/workload_with_EOF.pcap not present, skipping test