fs: add consistent flag fall throughs

stringToFlags() has fall throughs in a case statement.
However, they are not consistently implemented. This commit adds
consistency.

Signed-off-by: Trevor Norris <trev.norris@gmail.com>
docs: Update docs on TEST single test run.

The Contributing docs now clarify how to run a single test.

Signed-off-by: Fedor Indutny <fedor@indutny.com>
crypto: check protocol version at handshake header

Signed-off-by: Fedor Indutny <fedor@indutny.com>
crypto: fix version check in hello parser

This is a follow up for 89cb740fc31f3be1c3af9fe787c7a405429ccac4
readline: fixes scoping bug