vendor: change wmi package to try and fix a memory leak

Revert from COINIT_APARTMENTTHREADED to COINIT_MULTITHREADED

This reverts commit df9318a151db65985bf783c256650d31032525d5.

We are still seeing a memory leak, just much slower.
About 120MB per day in scollector. I'll keep looking but pretty sure this commit
causes the issue.

sourced from commit e54cbda6595d7293a7a468ccf9525f6bc8887f99 on github.com/stackexchange/wmi

Author: gbrayut

vendor/github.com/StackExchange/wmi/wmi.go

@@ -626,8 +626,8 @@
 		},
 		{
 			"path": "github.com/stackexchange/wmi",
-			"revision": "771c736650b4aabf956d9103ba5bf439414f79f9",
-			"revisionTime": "2016-07-24T15:06:07+02:00"
+			"revision": "e54cbda6595d7293a7a468ccf9525f6bc8887f99",
+			"revisionTime": "2016-08-11T15:45:55-06:00"
 		},
 		{
 			"path": "github.com/syndtr/goleveldb/leveldb",