The submission_over_tls_address configuration option has existed for a
long time, but was not properly documented.
This patch adds it to the manpage, as well as printing it in the
configuration output on startup.
This patch adds man pages for chasquid's main commands and
configuration. They are generated using pod2man (commonly used for this,
and included with perl in most distributions).
The generated man pages are included to avoid introducing a dependency
for such simple task, similar to how we handle protocol buffer generated
files.
