Docs: reinforce warning against using networks not available to all hosts

[stuclem]

Per vmware/vic-ui#73 (comment) we need to reinforce the warning in the docs about not using networks that are not available to all hosts in the cluster.

[stuclem]

Beefed up the note that all hosts must be able to access all DPGs in:

• Networking Requirements for VCH Deployment
• VCH Networks

@hmahmood is this OK? Thanks!

[stuclem]

@hmahmood can you please review the following note?:

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IMPORTANT: All hosts in a cluster must be attached to the port groups that you use for the VCH networks and for any mapped container networks.

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Also, can you please take another look at the entire section on Networking Requirements for VCH Deployment? Thanks!

[hmahmood]

Shouldn't this be a recommendation instead of a requirement? That note makes it seems like it is a requirement.

From the section on Networking: "If you use the Create Virtual Container Host wizard to deploy VCHs, you must create and use a port group for the public network." Is this a requirement when using the wizard only or in general? It seems like this should again be a recommendation and we should caution against it, not be an absolute requirement.

[stuclem]

Thanks @hmahmood, I only just saw this. In the UI, public network is mandatory and it is a requirement to create a DPG for it. In the CLI, if you don't specify --public-network, then it defaults to VM Network. So, it's a requirement in the UI and a recommendation in the CLI.

For the note about all hosts being attached to PGs, I downgraded it to "All hosts should...." rather than "must".

[stuclem]

Merged in #1259