all/windows: Be case in-sensitive about pattern matching. (#3682)

Resource strings and paths are case insensitive on windows
deployments but if user happens to use upper case instead of
lower case for certain configuration params like bucket
policies and bucket notification config. We might not honor
them which leads to a wrong behavior on windows.

This is windows only behavior, for all other platforms case
is still kept sensitive.

cmd/lockinfo-handlers.go

@@ -16,10 +16,7 @@
 
 package cmd
 
-import (
-	"strings"
-	"time"
-)
+import "time"
 
 // SystemLockState - Structure to fill the lock state of entire object storage.
 // That is the total locks held, total calls blocked on locks and state of all the locks for the entire system.
@@ -82,7 +79,7 @@ func listLocksInfo(bucket, prefix string, duration time.Duration) []VolumeLockIn
 			continue
 		}
 		// N B empty prefix matches all param.path.
-		if !strings.HasPrefix(param.path, prefix) {
+		if !hasPrefix(param.path, prefix) {
 			continue
 		}