support/scripts/graph-build-time: add download times

Total build time also involves download. Getting a visibility on the impact
of that step can be important for users/admins, e.g. to evaluate different
methods of BR2_PRIMARY_SITE.

Colors used are some kind of purple (primary scheme) and light orange
(alternate scheme).

Signed-off-by: Mathias De Maré <mathias.de_mare@nokia.com>
[ThomasDS: rebase and update colors to avoid confusion]
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Tested-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

support/scripts/graph-build-time

@@ -69,14 +69,14 @@ import matplotlib.font_manager as fm  # noqa: E402
 import csv                            # noqa: E402
 import argparse                       # noqa: E402
 
-steps = ['extract', 'patch', 'configure', 'build',
+steps = ['download', 'extract', 'patch', 'configure', 'build',
          'install-target', 'install-staging', 'install-images',
          'install-host']
 
-default_colors = ['#e60004', '#009836', '#2e1d86', '#ffed00',
+default_colors = ['#8d02ff', '#e60004', '#009836', '#2e1d86', '#ffed00',
                   '#0068b5', '#f28e00', '#940084', '#97c000']
 
-alternate_colors = ['#00e0e0', '#3f7f7f', '#ff0000', '#00c000',
+alternate_colors = ['#ffbe0a', '#00e0e0', '#3f7f7f', '#ff0000', '#00c000',
                     '#0080ff', '#c000ff', '#00eeee', '#e0e000']