NeutronManager: Remove explicit check of the existence of an attribute

To simplify the code a little.  No functional changes.

Change-Id: I862bb2a3d2bf808826c31888f3401709a1be086f
Updated from global requirements

Added exclusions for newly triggered errors.

Change-Id: I580c4a6a3861c399e010f435c0b92ed719d6a418
remove E112 hacking exemption and fix errors

Change-Id: I6031ad2274c677b071a03068e5fb3c000fec7723
Partial-Bug: 1329017
Merge "Updated from global requirements"
Merge "remove E112 hacking exemption and fix errors"
Merge "NeutronManager: Remove explicit check of the existence of an attribute"