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, 35 deletions

diff --git a/middleware/rewrite/class.go b/middleware/rewrite/class.go
deleted file mode 100644
index 8cc7d26b7..000000000
--- a/middleware/rewrite/class.go
+++ /dev/null
@@ -1,35 +0,0 @@
-package rewrite
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/miekg/dns"
-)
-
-type classRule struct {
-	fromClass, toClass uint16
-}
-
-func newClassRule(fromS, toS string) (Rule, error) {
-	var from, to uint16
-	var ok bool
-	if from, ok = dns.StringToClass[strings.ToUpper(fromS)]; !ok {
-		return nil, fmt.Errorf("invalid class %q", strings.ToUpper(fromS))
-	}
-	if to, ok = dns.StringToClass[strings.ToUpper(toS)]; !ok {
-		return nil, fmt.Errorf("invalid class %q", strings.ToUpper(toS))
-	}
-	return &classRule{fromClass: from, toClass: to}, nil
-}
-
-// Rewrite rewrites the the current request.
-func (rule *classRule) Rewrite(w dns.ResponseWriter, r *dns.Msg) Result {
-	if rule.fromClass > 0 && rule.toClass > 0 {
-		if r.Question[0].Qclass == rule.fromClass {
-			r.Question[0].Qclass = rule.toClass
-			return RewriteDone
-		}
-	}
-	return RewriteIgnored
-}