Investigate potential catch-22 in revision auto pulling mechanism

[davidlatwe]

When calling rezup use {name}, the command checks remote container for new revision and pulls one if there is. This design might have a potential problem is that when the command fails to create the new revision, it will keep pulling next time and fails again, deadlock.

Improvement

• Better to define a max pulling retry time in single command call, and fallback to old revision if failed.
• When fallback to old revision, prompt warning every time it's being accessed by CLI.
• Recipe should have entries to indicate who authored it, e.g. author, email, and these info could be used in warning message above.