Japan's Rakuten plans new share issue to raise around $2.2 bln…

Rakuten board could meet as early as this week -source * Rakuten plans to issue shares to CEO Mikitani -source * Company has been selling assets to raise cash * Rakuten shares closed down 9%, biggest one-day fall in 3 years (Adds analyst quote, share milestone, bullets) By Miho Uranaka TOKYO, May 15 (Reuters) - Japan's Rakuten Group Inc is finalising plans to raise about $2.2 billion by issuing new shares, according to two people, in the e-commerce company's latest move to shore up its finances after years of losses from its mobile business. Rakuten's board could meet as early…