Similar to cap_mkdb(1), add endianness support to services_mkdb(1)
to support cross-builds once this is invoked during releases.
Generate /var/db/services.db during 'make distribution' so that it is
present during new installs.  Update etcupdate and mergemaster to
ignore the generated file.

Tested by:	gjb (release build)
MFC after:	1 month
Add quiet support for kldstat -n

PR:		bin/180014
Submitted by:	Olivier Cochard-Labbé <olivier@cochard.me>
MFC after:	1 week