Fix comments, test names, and test race conditions in network

network/address/addressSpace.go

network/address/addressSpace_test.go

network/cmixMessageBuffer.go

network/cmixMessageBuffer_test.go

network/critical.go

network/follow.go

network/gateway/hostPool.go

network/gateway/hostpool_test.go

network/gateway/sender.go

network/gateway/sender_test.go

network/gateway/storeHostList_test.go

network/gateway/utils_test.go

network/health/tracker_test.go

network/historical/historical_test.go

network/identity/receptionID/IdentityUse.go

network/identity/receptionID/identity.go

network/identity/receptionID/identity_test.go

network/identity/receptionID/registration_test.go

network/identity/receptionID/store/checkedRounds_test.go

network/identity/receptionID/store/unknownRounds_test.go