CLOUDSTACK-7841: Gracefully reload haproxy config

The old way would disconnect all the existing connections through haproxy when
reload the config.

This new way would ensure that all the existing connections would still alive
after reload the config.
Fixed CLOUDSTACK-7242: Adding a securing config using configDepo doesnt work

In ConfigurationVo, changed the setter to do the encryption if required
like the getter. Called the setter in constructor as well.

Removed references of encryption check in different places.

Reviewed-by: Santhosh Edukulla

This closes #35