CS CRC values may lead to confusion

[skliper]

The CS application relies on the CFE_ES_CalculateCRC function to report the CRCs that it calculates. However, this function calculates the CRC as an int16 value and returns that value as a uint32 value. This causes the sign bit of the int16 (bit 15) to be propagated to the upper 16 bits of the uint32. If this bit is set, it can cause confusion since a CRC of 0x845E would result in the CS application having a value of 0xFFFF845E.

Imported from GSFCCFS-929