Update Galaxy to 18.05

[afgane]

Do a (GVL) release with CloudMan 1 to include Galaxy 18.05:

• [x] Build a new updated machine image
• [x] Update CloudMan code to work with uwsgi
• [x] Allow manual editing of Galaxy config and not have CloudMan overwrite it
• [x] Base all tool installs on Conda; however, most likely won't install the dependencies due to size and instead install only the wrappers with the deps being filled in on first job run (potentially install a few common deps)
• [ ] Build and upload the file system archive; create CloudFront distribution; update refs
• [ ] 10 other things I'm forgetting or will emerge

[nuwang]

Closing because old version.