Resume cctexture download

[zeal-up]

Since when download cctexture always abort sometimes with internet issue， sometimes the request target is not a zip file and the script raises an exception. I add two features:

1. use a socket session to request and setting the retry as 3 times in one request
2. ignore un-zip file after download

another change just add a time record in generate linemod scripts

[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: lab-lin.ziyao. This is most likely caused by a git client misconfiguration; please make sure to:

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[themasterlink]

Thanks, this got solved in #658