Check Name Availability/Validation for SQL Resources

[melonrush13]

PR Fixes
Addresses issue #214

PR Adds the following:

• CheckNameAvailability function to the SqlClient GoSDK
• ToAvailabilityResponse function which converts response messages from CheckNameAvailability
• Event Recorder which records the error of the server name
• Stops Requeue of the reconcile loop once sqlserver message is servername is invalid

Running the test:

• Run the operator using make run
• Create a sqlserver with the name sqlserver1.2 in the file: config/samples/azure_v1_sqlserver.yaml
• In another terminal window, run kubectl create -f config/samples/azure_v1_sqlserver.yaml file

Should get an error in the first terminal for:
DEBUG controller-runtime.manager.events Warning {"object": {"kind":"SqlServer","namespace":"default","name":"sqlserver1.2","uid":"9311940d-e168-11e9-b1dc-5a2bc381628e","apiVersion":"azure.microsoft.com/v1","resourceVersion":"160697"}, "reason": "Failed", "message": "Servername is invalid"} 2019-09-27T14:51:35.917-0600 INFO controllers.SqlServer Specified server name contains unsupported characters or is too long. Server name must be no longer than 63 characters long, contain only lower-case characters or digits, cannot contain '.' or '_' characters and can't start or end with '-' character. {"sqlserver": "default/sqlserver1.2"} 2019-09-27T14:51:35.917-0600 INFO controllers.SqlServer Servername is invalid {"sqlserver": "default/sqlserver1.2"} 2019-09-27T14:51:35.917-0600 ERROR controller-runtime.controller Reconciler error {"controller": "sqlserver", "request": "default/sqlserver1.2", "error": "Servername invalid sqlserver1.2"}

• Run a kubectl describe sqlserver sqlserver1.2, should get:

Events:
  Type     Reason  Age                 From                  Message
  ----     ------  ----                ----                  -------
  Warning  Failed  20m (x21 over 75m)  SqlServer-controller  Servername is invalid

Controller successfully errors out, and
If applicable:

• this PR contains documentation
• this PR contains tests

[melonrush13]

Fixed those three @frodopwns ! Thanks for that. Lemme know if there is anything else you think could be better/needs fixing.

[jananivMS]

LGTM except for the minor comment