Add support for enabling and enforcing FIPS mode in OpenSSL:
- Add configure option --enable-fips-mode that detects and enables FIPS mode
- Add a function to enable FIPS mode and call it on crypto init
- Log an OpenSSL error when FIPS_mode_set() fails and exit
- Report FIPS mode status in a separate log message from named
(cherry picked from commit c4cee27f)
Closes #506 (closed)