peer/peer_test: Fix race conditions in peer test.

[johnsonjh]

Previously, these tests had unavoidable race issues due to relying on perfect timing - instead, rely on a time range which eliminates the issue while still maintaining the effectiveness of the test.

 » go test -count=500000 -cpu=1,12,128 -timeout=0 . 
ok  	github.com/pkt-cash/pktd/peer	1607.208s

 » go test -count=1000 -cpu=12 -race -timeout=0 .
ok  	github.com/pkt-cash/pktd/peer	21.322s

[cjdelisle]

conflict

[johnsonjh]

I'll rebase.

[johnsonjh]

@cjdelisle rebased

[johnsonjh]

• Verified clean merge with recursive strategy against develop as of Thu Nov 26 02:01:32 PM EST 2020 + PR Improvement in bbolt/walletdb speed #111 + PR More reliably detect if we are current (or not.) #142 + PR Fix bug where pktctl -h would show help twice. #151 + PR blockchain: Avoid deadlock with additional locking #156 + PR peer: Default to 1s default trickle interval #160 + PR Optimization: Compare strings to a null string directly #168 + PR Fix cookie authentication; always show version information #175 + PR btcutil/hdkeychain/extendedkey.go: Fix a typo. #185 + PR Remove TTY detection #201

Merge made by the 'recursive' strategy.
 peer/peer_test.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

[johnsonjh]

• NOTE: Applied to WIP rebase branch successfully.