htdbm:

 - Add vxl to getopt
 - Remove "-C" from usage for -x and -l
 - Add space between -C and "cost"
 - Usage reorder and sync with htpasswd
htpasswd:
 - Usage reorder and sync with htdbm

Backport of r1420644 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1420925 13f79535-47bb-0310-9956-ffa450edef68