New and improved SQL Always On template

[JeffGoldner]

Many improvements including realistic VM sizes, ability to select how many data disks, select the sample database name, supports SQL 2016 SP1 and SP2 on Windows Server 2016 (2017 in development), shortened names to be compliant with NetBIOS lengths.

Replaces sql-2016-ha.

[bganapa]

@knithinc , @vikasnav to review

[cblackuk]

True godsend, cannot wait for this to be merged so we can start using it properly.

[JackLeo]

Do this also include #367 ?

[cblackuk]

@JackLeo it does ->

       "sqlServerOffer": {
            "type": "string",
            "allowedValues": [
                "SQL2016SP1-WS2016",
                "SQL2016SP2-WS2016"
        ],
            "metadata": {
                "description": "The SQL Server Version"
            },
            "defaultValue": "SQL2016SP2-WS2016"
        },

It is just done slightly different this time around but it supports SP2 and is in fact the default.