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, 31 deletions

diff --git a/middleware/pkg/cache/cache_test.go b/middleware/pkg/cache/cache_test.go
deleted file mode 100644
index 2c92bf438..000000000
--- a/middleware/pkg/cache/cache_test.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package cache
-
-import "testing"
-
-func TestCacheAddAndGet(t *testing.T) {
-	c := New(4)
-	c.Add(1, 1)
-
-	if _, found := c.Get(1); !found {
-		t.Fatal("Failed to find inserted record")
-	}
-}
-
-func TestCacheLen(t *testing.T) {
-	c := New(4)
-
-	c.Add(1, 1)
-	if l := c.Len(); l != 1 {
-		t.Fatalf("Cache size should %d, got %d", 1, l)
-	}
-
-	c.Add(1, 1)
-	if l := c.Len(); l != 1 {
-		t.Fatalf("Cache size should %d, got %d", 1, l)
-	}
-
-	c.Add(2, 2)
-	if l := c.Len(); l != 2 {
-		t.Fatalf("Cache size should %d, got %d", 2, l)
-	}
-}