Revert "add collection for buckets"

This reverts commit 96af571219.

other/java/client/src/main/proto/filer.proto

@@ -125,7 +125,6 @@ message Entry {
 
     RemoteEntry remote_entry = 10;
     int64 quota = 11; // for bucket only. Positive/Negative means enabled/disabled.
-    string collection = 12; // for bucket only. Empty means using default bucket name.
 }
 
 message FullEntry {

weed/pb/filer.proto

@@ -125,7 +125,6 @@ message Entry {
 
     RemoteEntry remote_entry = 10;
     int64 quota = 11; // for bucket only. Positive/Negative means enabled/disabled.
-    string collection = 12; // for bucket only. Empty means using default bucket name.
 }
 
 message FullEntry {

weed/pb/filer_pb/filer.pb.go

@@ -341,8 +341,7 @@ type Entry struct {
 	HardLinkCounter int32             `protobuf:"varint,8,opt,name=hard_link_counter,json=hardLinkCounter,proto3" json:"hard_link_counter,omitempty"` // only exists in hard link meta data
 	Content         []byte            `protobuf:"bytes,9,opt,name=content,proto3" json:"content,omitempty"`                                           // if not empty, the file content
 	RemoteEntry     *RemoteEntry      `protobuf:"bytes,10,opt,name=remote_entry,json=remoteEntry,proto3" json:"remote_entry,omitempty"`
-	Quota           int64             `protobuf:"varint,11,opt,name=quota,proto3" json:"quota,omitempty"`          // for bucket only. Positive/Negative means enabled/disabled.
-	Collection      string            `protobuf:"bytes,12,opt,name=collection,proto3" json:"collection,omitempty"` // for bucket only. Empty means using default bucket name.
+	Quota           int64             `protobuf:"varint,11,opt,name=quota,proto3" json:"quota,omitempty"` // for bucket only. Positive/Negative means enabled/disabled.
 }
 
 func (x *Entry) Reset() {
@@ -447,13 +446,6 @@ func (x *Entry) GetQuota() int64 {
 	return 0
 }
 
-func (x *Entry) GetCollection() string {
-	if x != nil {
-		return x.Collection
-	}
-	return ""
-}
-
 type FullEntry struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -4506,7 +4498,7 @@ var file_filer_proto_rawDesc = []byte{
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@@ -4532,9 +4524,7 @@ var file_filer_proto_rawDesc = []byte{
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