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/command/scaffold/security.toml

@@ -94,10 +94,14 @@ allowed_commonNames = ""    # comma-separated SSL certificate common names
 [grpc.client]
 cert = ""
 key = ""
-# Note: work in progress!
-#     this does not work with other clients, e.g., "weed filer|mount" etc, yet.
+
+# https client for master|volume|filer|etc connection
+# It is necessary that the parameters  [https.volume]|[https.master]|[https.filer] are set
 [https.client]
 enabled = true
+cert = ""
+key = ""
+ca = ""
 
 # volume server https options
 [https.volume]