Log Message:
samba4: updated to 4.21.2

Changes since 4.21.1
--------------------

o  Ralph Boehme <slow@samba.org>
   * BUG 15732: smbd fails to correctly check sharemode against OVERWRITE
     dispositions.
   * BUG 15754: Panic in close_directory.

o  Pavel Filipenský <pfilipensky@samba.org>
   * BUG 15752: winexe no longer works with samba 4.21.

o  Stefan Metzmacher <metze@samba.org>
   * BUG 14356: protocol error - Unclear debug message "pad length \ 
mismatch" for
     invalid bind packet.
   * BUG 15425: NetrGetLogonCapabilities QueryLevel 2 needs to be implemented.
   * BUG 15740: gss_accept_sec_context() from Heimdal does not imply
     GSS_C_MUTUAL_FLAG with GSS_C_DCE_STYLE.
   * BUG 15749: winbindd should call process_set_title() for locator child.

o  Martin Schwenke <mschwenke@ddn.com>
   * BUG 15320: Update CTDB to track all TCP connections to public IP addresses.