Change 14548

Add new P4#tagged() method, that takes a bool, and a block. It sets/clears
tagged output (as specified by the boolean), and runs the block. It then
resets the tagged output to its previous value. For example

   p4.tagged( false ) { ctr = p4.run_counter( 'change' ).to_i }

This is in fact the best use-case, since getting a counter value is
harder in tagged mode than in non-tagged mode. Most users
will not need this method.

User-visible enhancement documented in p4rubynotes.txt
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