Added tls for http clients (#5766)

* Added global http client

* Added Do func for global http client

* Changed the code to use the global http client

* Fix http client in volume uploader

* Fixed pkg name

* Fixed http util funcs

* Fixed http client for bench_filer_upload

* Fixed http client for stress_filer_upload

* Fixed http client for filer_server_handlers_proxy

* Fixed http client for command_fs_merge_volumes

* Fixed http client for command_fs_merge_volumes and command_volume_fsck

* Fixed http client for s3api_server

* Added init global client for main funcs

* Rename global_client to client

* Changed:
- fixed NewHttpClient;
- added CheckIsHttpsClientEnabled func
- updated security.toml in scaffold

* Reduce the visibility of some functions in the util/http/client pkg

* Added the loadSecurityConfig function

* Use util.LoadSecurityConfiguration() in NewHttpClient func

weed/replication/source/filer_source.go

@@ -15,6 +15,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
 	"github.com/seaweedfs/seaweedfs/weed/util"
+	util_http "github.com/seaweedfs/seaweedfs/weed/util/http"
 )
 
 type ReplicationSource interface {
@@ -106,7 +107,7 @@ func (fs *FilerSource) LookupFileId(part string) (fileUrls []string, err error)
 func (fs *FilerSource) ReadPart(fileId string) (filename string, header http.Header, resp *http.Response, err error) {
 
 	if fs.proxyByFiler {
-		return util.DownloadFile("http://"+fs.address+"/?proxyChunkId="+fileId, "")
+		return util_http.DownloadFile("http://"+fs.address+"/?proxyChunkId="+fileId, "")
 	}
 
 	fileUrls, err := fs.LookupFileId(fileId)
@@ -115,7 +116,7 @@ func (fs *FilerSource) ReadPart(fileId string) (filename string, header http.Hea
 	}
 
 	for _, fileUrl := range fileUrls {
-		filename, header, resp, err = util.DownloadFile(fileUrl, "")
+		filename, header, resp, err = util_http.DownloadFile(fileUrl, "")
 		if err != nil {
 			glog.V(1).Infof("fail to read from %s: %v", fileUrl, err)
 		} else {