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, 44 deletions

diff --git a/middleware/file/dname.go b/middleware/file/dname.go
deleted file mode 100644
index 6bbfd9377..000000000
--- a/middleware/file/dname.go
+++ /dev/null
@@ -1,44 +0,0 @@
-package file
-
-import (
-	"github.com/coredns/coredns/middleware/pkg/dnsutil"
-
-	"github.com/miekg/dns"
-)
-
-// substituteDNAME performs the DNAME substitution defined by RFC 6672,
-// assuming the QTYPE of the query is not DNAME. It returns an empty
-// string if there is no match.
-func substituteDNAME(qname, owner, target string) string {
-	if dns.IsSubDomain(owner, qname) && qname != owner {
-		labels := dns.SplitDomainName(qname)
-		labels = append(labels[0:len(labels)-dns.CountLabel(owner)], dns.SplitDomainName(target)...)
-
-		return dnsutil.Join(labels)
-	}
-
-	return ""
-}
-
-// synthesizeCNAME returns a CNAME RR pointing to the resulting name of
-// the DNAME substitution. The owner name of the CNAME is the QNAME of
-// the query and the TTL is the same as the corresponding DNAME RR.
-//
-// It returns nil if the DNAME substitution has no match.
-func synthesizeCNAME(qname string, d *dns.DNAME) *dns.CNAME {
-	target := substituteDNAME(qname, d.Header().Name, d.Target)
-	if target == "" {
-		return nil
-	}
-
-	r := new(dns.CNAME)
-	r.Hdr = dns.RR_Header{
-		Name:   qname,
-		Rrtype: dns.TypeCNAME,
-		Class:  dns.ClassINET,
-		Ttl:    d.Header().Ttl,
-	}
-	r.Target = target
-
-	return r
-}