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1. password-checker.properties
   The following is the format of the file where each rule will be added in a separate line.
   pattern,optional
   pattern - Pattern to support in the password character set. Eg: @!#$%
   optional - Whether this password rule set is optional or not while enforcing the password strength 

The password strength is calculated based on the following algorithm:

1. Password Entropy = (log (N) * L ) / log (2)
   where L is the Length of the password
    and N is the total Length of the all character sets to be involved. 

References

 (1)  http://ianduffy.ie/cloudstack/CreatingAPlugin.pdf