q2-feature-tables usage examples render many quotes

[cherman2]

q2-feature-table filter-samples has many many quotes.

We need a function that does sane shell quoting for arbitrary strings.

Here is the line of code that is need to be change:

q2cli/q2cli/core/usage.py

Line 411 in 2801c5b

return [(option, shlex.quote(value))]

run this make in order to test: https://github.com/qiime2/q2cli/blob/dev/Makefile#L22-L24