Remove readonly property from id, name, type

[allencal]

Some established TrafficManager operations expect these resource values to be set.

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[jianghaolu]

@ravbhatnagar I don't think these properties are allowed to be set in ARM? Please help clarify, thanks!

[ravbhatnagar]

yes these have to be read-only.

[azuresdkci]

Can one of the admins verify this patch?