BUG: FFTConvolutionImageFilter outputs incorrect

When convolving an image (first) with a kernel (second)
the output image should maintain the physical spacing of
the first image.

Previous code always resulted in Identity for direction, spacing
and origin values.

Change-Id: Ie114408edf66e734e9adbc49fc9ae6c408efc325
Merge topic 'FixConvolutionOutputImageInformation'

bc13c812 BUG: FFTConvolutionImageFilter outputs incorrect