pit::Entry::canMatch is the single place to determine whether an Interest
matches an Interest table entry. This condition is asserted when an in/out-
record is inserted or updated. This prevents a strategy from incorrectly
picking an Interest that is incompatible with the Interest table entry.
refs #1756
Change-Id: Ibf61a0e2e32b7a0e04e581f01ef07b791c6010a2
