change the nmea sensor to "trusted"

update ntpd example configuration

Simplify example constraints URL to reduce load on the server side.
ok henning@, reyk@

Add support for "constraints": when configured, ntpd(8) will query the
time from HTTPS servers, by parsing the Date: header, and use the
median constraint time as a boundary to verify NTP responses.

Add support for "constraints": when configured, ntpd(8) will query the
time from HTTPS servers, by parsing the Date: header, and use the
median constraint time as a boundary to verify NTP responses. This
adds some level of authentication and protection against MITM attacks
while preserving the accuracy of the NTP protocol; without relying on
authentication options for NTP that are basically unavailable at
present. This is an initial implementation and the semantics will be
improved once it is in the tree.

Discussed with deraadt@ and henning@
OK henning@

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- move the ntpd.conf file to examples directory
- move it from BIN1 to EXAMPLES in src/etc/Makefile
- change the installer to create the file instead of editing it
- add a '+' to the corresponding ch

- move the ntpd.conf file to examples directory
- move it from BIN1 to EXAMPLES in src/etc/Makefile
- change the installer to create the file instead of editing it
- add a '+' to the corresponding changelist entry

suggested by and OK deraadt@
OK for the installer change krw@

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