Remove the word middleware (#1067)

* Rename middleware to plugin

first pass; mostly used 'sed', few spots where I manually changed
text.

This still builds a coredns binary.

* fmt error

* Rename AddMiddleware to AddPlugin

* Readd AddMiddleware to remain backwards compat

1 files changed, 0 insertions, 32 deletions

diff --git a/middleware/backend.go b/middleware/backend.go
deleted file mode 100644
index bf4bf8967..000000000
--- a/middleware/backend.go
+++ /dev/null
@@ -1,32 +0,0 @@
-package middleware
-
-import (
-	"github.com/coredns/coredns/middleware/etcd/msg"
-	"github.com/coredns/coredns/request"
-
-	"github.com/miekg/dns"
-)
-
-// ServiceBackend defines a (dynamic) backend that returns a slice of service definitions.
-type ServiceBackend interface {
-	// Services communicates with the backend to retrieve the service definition. Exact indicates
-	// on exact much are that we are allowed to recurs.
-	Services(state request.Request, exact bool, opt Options) ([]msg.Service, error)
-
-	// Reverse communicates with the backend to retrieve service definition based on a IP address
-	// instead of a name. I.e. a reverse DNS lookup.
-	Reverse(state request.Request, exact bool, opt Options) ([]msg.Service, error)
-
-	// Lookup is used to find records else where.
-	Lookup(state request.Request, name string, typ uint16) (*dns.Msg, error)
-
-	// Returns _all_ services that matches a certain name.
-	// Note: it does not implement a specific service.
-	Records(state request.Request, exact bool) ([]msg.Service, error)
-
-	// IsNameError return true if err indicated a record not found condition
-	IsNameError(err error) bool
-}
-
-// Options are extra options that can be specified for a lookup.
-type Options struct{}