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, 20 deletions

diff --git a/middleware/auto/regexp.go b/middleware/auto/regexp.go
deleted file mode 100644
index fa424ec7e..000000000
--- a/middleware/auto/regexp.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package auto
-
-// rewriteToExpand rewrites our template string to one that we can give to regexp.ExpandString. This basically
-// involves prefixing any '{' with a '$'.
-func rewriteToExpand(s string) string {
-	// Pretty dumb at the moment, every { will get a $ prefixed.
-	// Also wasteful as we build the string with +=. This is OKish
-	// as we do this during config parsing.
-
-	copy := ""
-
-	for _, c := range s {
-		if c == '{' {
-			copy += "$"
-		}
-		copy += string(c)
-	}
-
-	return copy
-}