James E. Blair 9afaed4d37 Add option to manage secrets outside of helm
So that a user can manage the nodepool config file (which is a secret)
outside of helm, add an option where the user can specify the name
of that secret as a value, and if it's set, helm will not write the
secret and will tell k8s to mount that secret as the nodepool config
instead.

Change-Id: Ifa1b5e81b6c7700faef82f3b18aab157d042e735
2020-01-10 14:50:01 -08:00
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