The sizes of images should be limited when testing rounding in "test_image_streams".

When testing **_rounding_** in suite **_test_image_streams_**(source codes in conformance/images/kernel_read_write), the sizes of images to be created should be smaller than the max sizes that vendors support. But, for example, in file:
> conformance/images/kernel_read_write/test_read_2D_array.cpp

there is:
```
else if( gTestRounding )
{
size_t typeRange = 1 << ( get_format_type_size( imageInfo.format ) * 8 );
imageInfo.height = typeRange / 256;
imageInfo.width = (size_t)( typeRange / (cl_ulong)imageInfo.height );
imageInfo.arraySize = 2;

imageInfo.rowPitch = imageInfo.width * pixelSize;
imageInfo.slicePitch = imageInfo.height * imageInfo.rowPitch;
...
}
```
The maximum return value of **_get_format_type_size_** coulld be **_4_**, the maximum **_typeRange_** could be **_2^32_**(65536^2), resulting in the height of image being **_2^24_**(65536*256) which is out of the top bound most vendors support. This happens in:
> conformance/images/kernel_read_write/test_read_2D_array.cpp
conformance/images/kernel_read_write/test_read_3D.cpp
conformance/images/kernel_read_write/test_write_1D.cpp
conformance/images/kernel_read_write/test_write_1D_array.cpp
conformance/images/kernel_read_write/test_write_2D_array.cpp
conformance/images/kernel_read_write/test_write_3D.cpp
conformance/images/kernel_read_write/test_write_image.cpp

following files correctly deal with it:
> conformance/images/kernel_read_write/test_iterations.cpp
conformance/images/kernel_read_write/test_read_1D.cpp
conformance/images/kernel_read_write/test_read_1D_array.cpp

In test_read_1D_array.cpp:
```
else if( gTestRounding )
{
uint64_t typeRange = 1LL << ( get_format_type_size( imageInfo.format ) * 8 );
typeRange /= pixelSize / get_format_type_size( imageInfo.format );
imageInfo.arraySize = (size_t)( ( typeRange + 255LL ) / 256LL );
imageInfo.width = (size_t)( typeRange / (cl_ulong)imageInfo.arraySize );
while( imageInfo.arraySize >= maxArraySize / 2 )
{
imageInfo.width <<= 1;
imageInfo.arraySize >>= 1;
}

while( imageInfo.width >= maxWidth / 2 )
imageInfo.width >>= 1;
imageInfo.rowPitch = imageInfo.slicePitch = imageInfo.width * pixelSize;

...
}
```
I think this method is good.

Best wishes!
Feb. 13. 2020.

Start with the rounding branches in the seven listed conformance/images/kernel_read_write files, then compare them with the existing handling in test_iterations.cpp, test_read_1D.cpp, and test_read_1D_array.cpp. Run the test_image_streams rounding cases and verify that generated image dimensions stay within the supported maximums without losing the rounding coverage.

Written by the indexing model from the issue text.