SERVER-10273 Support variadic arguments to $bit in new update framework
SERVER-10275 Use size_t in pathsupport function
SERVER-10267 Remove in-place state from mods now that mutable and udpate driver handle it
SERVER-9067 Add mutable test utility for comparing docs ignoring object field order
SERVER-1891 Add redactForLogging() to Command.

Command::redactForLogging(mutablebson::Document* cmdObj) transforms "cmdObj"
into a form suitable for writing to logs.  This patch provides a sample
implementation for the user management commands that censors password fields,
and updates the audit hook for commands, appropriately.