[kubernetes] new data, namespace support, and options

This patch collects additional data from kubernetes masters, changes the
available plugin options, and makes collection namespace aware.

By default, json output will be collected for events, limitranges, pods, pvcs,
replicationcontrollers, resourcequotas and services on a per-namespace basis.

Note that the 'serviceaccount' and 'secrets' resources are not collected due to
the high risk of exposing secure information.

Version and 'config view' output is now collected.

The 'all' option (default enabled) will collect a non-json listing of each
resource across all namespaces for ease of reference.

The 'describe' option (default enabled) will collect 'kubectl describe' output,
non-json, for each object of each resource in each namespace, if present.

The 'podslog' option has been renamed to 'podlogs' and is disabled by default.

Note that while this will run on OpenShift v3 masters, only resources shared by
OpenShift and 'plain' Kubernetes are collected by this plugin. OpenShift routes
for example are not collected.

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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