Use ASSERT_EQ rather than CHECK_EQ in the socket tests
Use ASSERT_EQ rather than CHECK_EQ in the socket tests

Summary: Because `CHECK_EQ` is a fatal error, and makes it impossible to keep running the other tests if it fails, even if it was just a timeout.

Reviewed By: yfeldblum

Differential Revision: D4151084

fbshipit-source-id: db88dc2ef875e5d1fe31792f26a3dc2d223ded5e

facebook/folly,charsyam/folly,rklabs/folly,Orvid/folly,facebook/folly,facebook/folly,rklabs/folly,rklabs/folly,floxard/folly,rklabs/folly,Orvid/folly,charsyam/folly,Orvid/folly,facebook/folly,charsyam/folly,charsyam/folly,floxard/folly,rklabs/folly,floxard/folly,Orvid/folly,floxard/folly,floxard/folly,Orvid/folly,facebook/folly