CFE_ES_GenPoolInitialize: Error if AlignSize is not a power of 2

[skliper]

Is your feature request related to a problem? Please describe.
CFE_ES_GenPoolInitialize handles when AlignSize isn't a power of 2, but may be more appropriate as an error:

cFE/modules/es/fsw/src/cfe_es_generic_pool.c

Lines 253 to 269 in e80aae9

	/*
	* Convert alignment to a bit mask.
	* This sets all LSBs if the passed in value was not actually a power of 2.
	*/
	if (AlignSize <= 1)
	{
	AlignMask = 0;
	}
	else
	{
	AlignMask = AlignSize - 1;
	AlignMask |= AlignMask >> 1;
	AlignMask |= AlignMask >> 2;
	AlignMask |= AlignMask >> 4;
	AlignMask |= AlignMask >> 8;
	AlignMask |= AlignMask >> 16;
	}

Describe the solution you'd like
Analyze, make it an error or document why it's ok as-is for future reference

Describe alternatives you've considered
None

Additional context
Code review

Requester Info
Jacob Hageman - NASA/GSFC