Validate LB method provided in F5_BALANCE app label

[edarzins]

Description

There is currently only a subset of load-balancing (LB) methods the controller can support via the F5_BALANCE label (i.e. those that don't require additional parameters, like 'ratio'). We need to add some validation around the supplied LB method to verify it is a method that we can actually support.

Mesos Version

Any

Marathon Version

Any

Controller Version

1.1

BIG-IP Version

Any

[edarzins]

Actually, none of the LB methods supported by CCCL require additional parameters (these just get populated with default values). However, we'll move the validation of LB method to CCCL.

[edarzins]

Resolved via b951593f06dfe2d233d98a1305ccdabf79659379.