Migration Of Kong With Cassandra to Kong With Postgres in fri/server

[saksham-gera]

[saksham-gera]

Hi @pradeeban, please let me know if I should take up this issue, as I have successfully migrated the mediator, and the same is required here. Along with this I'll fix Issues #145 & #146 too as those are relatively small issues.

[pradeeban]

Sounds good. Go ahead!