By Kate Holton, Elizabeth Piper and Alistair Smout LONDON (Reuters) -Scandal-ridden Boris Johnson announced on Thursday he would quit as British prime minister after he dramatically lost the support of his ministers and most Conservative lawmakers, but said he would stay on until his successor was chosen. Bowing to the inevitable as more than 50 ministers quit and lawmakers said he must go, an isolated and powerless Johnson said it was clear his party wanted someone else in charge, but that his forced departure was “eccentric”. “Today I have appointed a cabinet to serve, as I will, until a new…

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