[vtkusers] Using VTK 7.1 with GL 3.0 version crashing the application

[Chandrasekhar B]

I have a crash when importing stl file in the virtual machine.
I am using VTK 7.1 version. The crash is because of the GLSL version
supported by the VM.
The GL version supported by VM is 3.0.

I have fixed this issue in the following function by adding the following
code.

unsigned int vtkOpenGLShaderCache::ReplaceShaderValues(
  std::string &VSSource,
  std::string &FSSource,
  std::string &GSSource)
{

if (glMajorVersion >= 3)
    {
    version = "#version 150\n";
if (glMajorVersion == 3 && glMinorVersion == 0)
{
version = "#version 130\n";
}
}

Just wanted to check, is this right fix?
How do I support GL 3.0 using VTK 7.1?
or do I need to upgrade to later version of VTK?
Currently, all the VMs we have use GL 1.3.

Regards
Shekar
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