Code review comment for ~sylvain-pineau/checkbox-core-snap:add-glmark2-es2

Here's the result of running it with checkbox-snappy and checkbox-snappy-classic respectively, glmark2-es2 works fine with checkbox-snappy-classic but still won't start with checkbox-snappy, is this expected?

- System info
I tested it on my laptop which runs ubuntu desktop 20.04
$ uname -a
Linux zongminl-Inspiron-7370 5.4.0-60-generic #67-Ubuntu SMP Tue Jan 5 18:31:36 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal

- Run with checkbox-snappy-classic:
zongminl@zongminl-Inspiron-7370:~$ sudo checkbox-snappy-classic.shell
checkbox-snappy-classic runtime shell, type 'exit' to quit the session
root@zongminl-Inspiron-7370:/home/zongminl# glmark2-es2
=======================================================
    glmark2 2020.04
=======================================================
    OpenGL Information
    GL_VENDOR: Intel
    GL_RENDERER: Mesa Intel(R) UHD Graphics 620 (KBL GT2)
    GL_VERSION: OpenGL ES 3.2 Mesa 20.2.6
=======================================================
[build] use-vbo=false: FPS: 3516 FrameTime: 0.284 ms
[build] use-vbo=true: FPS: 3624 FrameTime: 0.276 ms
=======================================================
                                  glmark2 Score: 3570
=======================================================

- Run with checkbox-snappy:
zongminl@zongminl-Inspiron-7370:~$ sudo checkbox-snappy.shell
checkbox-snappy runtime shell, type 'exit' to quit the session
root@zongminl-Inspiron-7370:/home/zongminl# glmark2-es2
Error: Failed to open models directory '/usr/share/glmark2/models'
Error: Failed to open models directory '/usr/share/glmark2/models'
Error: Failed to open models directory '/usr/share/glmark2/textures'
Error: Failed to open models directory '/usr/share/glmark2/models'
Error: Failed to open models directory '/usr/share/glmark2/models'
Error: Failed to open models directory '/usr/share/glmark2/textures'
Error: eglGetDisplay() failed with error: 0x3000
Error: eglGetDisplay() failed with error: 0x3000
Error: main: Could not initialize canvas