Don't change Histogram values during Snapshot (uber-go#142)

* Calling Snapshot changes recorded Histograms

Update test to call `scope.Snapshot()` repeatedly.

Call `(*counter).snapshot` instead of `(*counter).value` when compiling
a snapshot of histograms, so as not to alter the value of the histogram
during the operation.

Allow Prometheus reporter listen on unix domain socket address (uber-…

…go#135)

* Allow prometheus reporter listen on unix domain socket address

* Use ListenNetwork field to make it specific

* Unfortunately, CI currently does not support ipv6

* Address comment

Co-authored-by: Fuyuan Bie <[email protected]>

Optimize Scope.cacheReport (uber-go#121)

Use raw concat instead of fmt.Sprintf for fullyQualifiedName (uber-go…

…#124)

Add context/test for Tally<>Prometheus usage discrepancies (uber-go#114)

Flush reporter from root scope only (uber-go#108)

Vendor apache thrift due to build incompatibility >= 0.10.0 (uber-go#104

)

* Vendor apache thrift due to build incompatibilities between 0.11.0 and 0.12.0
* Vendor 0.10.0 without dependencies on context
* Fix lint
* Rename vendored files to thirdparty

Fix OnRegisterError not being called correctly when listen port in use (

uber-go#103)

Pin dependencies to semver (uber-go#102)

Use RWMutex instead of defer/recover to avoid publishing to closed ch…

…annel in M3 reporter (uber-go#90)