Handle Address 2.0.x #locality which is now an array [#3498013]

Problem/Motivation

The implode at the bottom of formatPlainAddress() caused a PHP warning because #locality can now be an array. We need to handle #locality as either a string (for 8.x--1.x) or an array (for 2.0.x)

Issue fork address_static_map-3498013

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3498013--address-2.0.x-locality changes, plain diff MR !2
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