AHMED ELUMAMI and AYMAN AL-WARFALI WHEN the power cut out in Libya's Benghazi last week, Haitham al-Ghoul dashed into the street with his five-year-old son Othman to find somewhere to plug in a respirator the child needs to ease asthma attacks. A photograph of Ghoul hugging Othman on the street with the respirator hooked up to a shop's private generator soon went viral on Libyan social media networks, symbolising a power crisis that has infuriated Libyans across political divides. "We suffer a lot from power cuts in Benghazi. I'm just one of many cases," Ghoul said. Frustration at power cuts…