reduce noisy log messages from wget

[raulchen]

Currently, wget prints tons of progress messages (roughly 1900 lines, see below), which makes the log hard to read.
This is because, by default, wget prints a dot for each 10k received data. With this change, it prints a dot for every 1M data.

         0K .......... .......... .......... .......... ..........  0% 60.2K 26m20s
        50K .......... .......... .......... .......... ..........  0%  171K 17m47s
       100K .......... .......... .......... .......... ..........  0%  257K 13m54s
       150K .......... .......... .......... .......... ..........  0%  330K 11m37s
       200K .......... .......... .......... .......... ..........  0%  438K 10m1s
       250K .......... .......... .......... .......... ..........  0%  503K 8m52s
       300K .......... .......... .......... .......... ..........  0%  483K 8m4s
       350K .......... .......... .......... .......... ..........  0%  815K 7m17s
       400K .......... .......... .......... .......... ..........  0%  554K 6m48s
       450K .......... .......... .......... .......... ..........  0%  454K 6m28s
...

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/Ray-PRB/7486/
Test PASSed.

[pcmoritz]

Thanks, this is great! Maybe we can do something similar for pip, it currently also prints a lot of progress.

[raulchen]

@pcmoritz created #2667