Update apache/thrift to 0.11.0 and remove pinning (#1317)

The `apache/thrift` recently released a new version of `0.11.0`
several days ago. This release is compatible with other packages
and as such, there is no need to pinning the `apache/thrift`
to `master` anymore in Gopkg.toml.

This fix removes the pinning of `apache/thrift` in Gopkg.toml,
and updates all dependencies of coredns.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

vendor/github.com/imdario/mergo/testdata/license.yml

@@ -1,4 +0,0 @@
-import: ../../../../fossene/db/schema/thing.yml
-fields:
-    site: string
-    author: root

vendor/github.com/imdario/mergo/testdata/thing.yml

@@ -1,6 +0,0 @@
-fields:
-    id: int
-    name: string
-    parent: ref "datu:thing"
-    status: enum(draft, public, private)
-    author: updater