Remove tests that check non-zero values for reservedMustBeZero on all APIs

Remove tests that check non-zero values for reservedMustBeZero on all APIs

Although initially it was agreed to keep them for the APIs that still
include that field as reserved, and only remove them when the API
defines the field (baseInstance), in the end it was agreed to remove
it completely, as it is testing an undefined behaviour.

Components: OpenGL, OpenGL ES

VK-GL-CTS issue: 2029

Affects:
KHR-GL40.draw_indirect.misc-reservedMustBeZero-arrays
KHR-GL40.draw_indirect.misc-reservedMustBeZero-elements
KHR-GL41.draw_indirect.misc-reservedMustBeZero-arrays
KHR-GL41.draw_indirect.misc-reservedMustBeZero-elements
KHR-GLES31.core.draw_indirect.misc-reservedMustBeZero-arrays
KHR-GLES31.core.draw_indirect.misc-reservedMustBeZero-elements

Change-Id: Iafe3e711107da818a392ebcdfe50379cf3790d17