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Horizon has removed Saharaclient and Troveclient from its dependencies, so, remove their code from Manila-UI too. Latest release of Manilaclient v1.6.0 broke possibility to import deprecated v1 API modules having b_u_g 1535692. So, change usage of manilaclient in the way when we do not hit that bug. Change-Id: I907502a6dcb9ff8521935428bbb34b930b134553 Closes-Bug: #1535657