1. Add: Enable lazy writing for normal bucket

removed unnecessary logs

1. Refactor: Move FDBSecParams struct to securitymdl to make it accessible to filepack package. Will get cyclic dependency issue if kept in corefdb package.

1. Add: Security for Normal bucket files

1. Add: Generate security key for a file in FDB. Support for shared file encryption.

1. Fix: Error not returned on validation fail

1. Add: FDB related security options.

* added encryption support in fdb 
* added feature of dynamic encryption key generation function

notidicationmdl-Email- plain mail,html handlebar mail support
securitymdl-GetHash and GetHashAndSalt methods added

method added to match hashed pwd with original

Added CreateSecurityKey and SaltPassword methods to securitymdl

HttpClientmdl, HttpServermdl, errormdl , hashmdl, securitymdl, testingdata