* with region in turmoil, Israel keeps a wary eye on its borders * Israel and Jordan signed peace accord 20 years ago this week * Agreement a basis for close cooperation as Syria, Iraq boil By Luke Baker JERUSALEM, Oct 22 (Reuters) - If there were a heat map showing instability in the Middle East, the area around most of Israel's borders would have turned a steadily deeper shade of red over the past few years. with attacks by Hezbollah from Leba**n, the threat from Islamic State and the Nusra Front in Syria and growing unrest in Egypt's Sinai, the **rth and south are on edge. ...