Dispatch base test does not enable pipeline flag

Dispatch base test does not enable pipeline flag

dEQP-VK.compute.device_group.dispatch_base does not enable pipeline flag which violates valid usage rule: If any of baseGroupX, baseGroupY, or baseGroupZ are not zero, then the currently bound
compute pipeline must have been created with the VK_PIPELINE_CREATE_DISPATCH_BASE flag.

An overloaded method vktComputeTestsUtil.cpp::makeComputePipeline was added that allows to pass additional parameters:
- flags for pipeline creation
- flags for compute shader creation
Old method redirected to call a new one with flags set to zero.

A method vktComputeTestsUtil.cpp::makePipelineLayout no longer takes useDeviceGroups parameter and always sets pipeline layout flags to 0.

New method used in test with proper flags passed in.

Component: Vulkan

VK-GL-CTS issue: 760

Affects: dEQP-VK.compute.device_group.dispatch_base

Change-Id: I2c7400a55809b28bb7096dcdfeba2095c1541e1b