Remove 4 non-essential booleans from transaction state

We dont need a boolean & value stored in the transaction state for each request, a value defaulted to -1 will do just fine.

int INKHttpTxnActiveTimeoutSet(...)
int INKHttpTxnConnectTimeoutSet(...)
int INKHttpTxnDNSTimeoutSet(...)
int INKHttpTxnNoActivityTimeoutSet(...)