Service Sync annotations and labels

The following Kubernetes resource annotations could be used on a pod to Service Sync behavior:

consul.hashicorp.com/service-sync: If this is set to true, then the Kubernetes service is explicitly configured to be synced to Consul.
```
annotations:
  'consul.hashicorp.com/service-sync': 'true'
```
consul.hashicorp.com/service-port: Configures the port to register to the Consul Catalog for the Kubernetes service. The annotation value may be a name of a port (recommended) or an exact port value. Refer to service ports for more information.
```
annotations:
  'consul.hashicorp.com/service-port': 'http'
```
consul.hashicorp.com/service-tags: A comma separated list of strings (without whitespace) to use for registering tags to the service registered to Consul. These custom tags automatically include the k8s tag which can't be disabled.
```
annotations:
  'consul.hashicorp.com/service-tags': 'primary,foo'
```
consul.hashicorp.com/service-meta-KEY: A map for specifying service metadata for Consul services. The "KEY" below can be set to any key. This allows you to set multiple meta values.
```
annotations:
  'consul.hashicorp.com/service-meta-KEY': 'value'
```
consul.hashicorp.com/service-weight: - Configures ability to support weighted loadbalancing by service annotation for Catalog Sync. The integer provided will be applied as a weight for the passing state for the health of the service. Refer to weights in service configuration for more information on how this is leveraged for services in the Consul catalog.
```
annotations:
  consul.hashicorp.com/service-weight: 10
```