HciMatchers: enforce argument requirement

If the command complete opcode is not specified then it
will match ANY command complete event which can prove to
be troubles some when getting a series of CommandComplete()
matches.

Bug: 162984360
Tag: #gd-refactor
Test: cert/run --host SecurityTest
Change-Id: Ia42c74c6476fd9d0763afa87ad1f61a243942e27