Update bootstrap.sh to use HTTPS instead of Git protocol

[kerbymart]

Update Git repositories to use HTTPS protocol instead of git:// because bootstrap.sh won't clone the repos (not sure why the git protocol does not work with GitHub)

APPSCALE_REPO="https://github.com/AppScale/appscale.git"
APPSCALE_TOOLS_REPO="https://github.com/AppScale/appscale-tools.git"
AGENTS_REPO="https://github.com/AppScale/appscale-agents.git"
THIRDPARTIES_REPO="https://github.com/AppScale/appscale-thirdparties.git"

[kerbymart]

Also, the tag last does not work, I had to add 3.8.1

[satya-500]

does your installation works fine?

@kerbymart

[kerbymart]

@satya-500 It's been a while since I tried GTS, it's been completely abandoned, but I suppose I was able to run it.