Update the mobile-cli to generate the hash value of the certificates as part of mobile-services.json file.

Why

We need the certificate hash in order to perform certificate pinning

What

When using the mobile-cli to generate the mobile-services.json file, it should check the certificate of each services that use https and generate the hash value automatically.

Suggested approach

Aiden has done a Poc: https://github.com/aerogear/mobile-cli/pull/71.

In order to make it easier to get all the hash values of the certs, we should consider group all the hashes together into one object, something like this:

```
{
"https": [

{ "host": "", "certificateHash": "" }

]
}
```

Trello link