Tests that cookies with the expires attribute can be set
Result of Network.setCookie with expires=0: {
    id : <number>
    result : {
        success : true
    }
    sessionId : <string>
}
Num of cookies 0
Result of Network.setCookie with expires=now+1000000: {
    id : <number>
    result : {
        success : true
    }
    sessionId : <string>
}
Num of cookies 1
name: baz, value: bar2, domain: 127.0.0.1, path: /, expires