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, 13 deletions

diff --git a/middleware/file/wildcard.go b/middleware/file/wildcard.go
deleted file mode 100644
index 9526cb53f..000000000
--- a/middleware/file/wildcard.go
+++ /dev/null
@@ -1,13 +0,0 @@
-package file
-
-import "github.com/miekg/dns"
-
-// replaceWithWildcard replaces the left most label with '*'.
-func replaceWithAsteriskLabel(qname string) (wildcard string) {
-	i, shot := dns.NextLabel(qname, 0)
-	if shot {
-		return ""
-	}
-
-	return "*." + qname[i:]
-}