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Old-style test fails on Ubuntu when python3 enabled, with: .../devstack/inc/python: line 52: [: 16.04: integer expression expected Use bash-style test, which doesn't attempt to evaluate the RHS if the LHS evaluates to false Change-Id: If18031ab98c9060e5825c3a8d3c647bd3705cd9c Closes-Bug: #1796174