weed.go: remove unused parameter

Signed-off-by: Lei Liu <liul.stone@gmail.com>

.gitignore

@@ -80,3 +80,6 @@ build
 target
 *.class
 other/java/hdfs/dependency-reduced-pom.xml
+
+# binary file
+weed/weed

weed/weed.go

@@ -21,7 +21,6 @@ import (
 )
 
 var IsDebug *bool
-var server *string
 
 var commands = command.Commands