chrony: upgrade 4.6.1 -> 4.7

Changelog:
==========
- Add opencommands directive to select remote monitoring commands
- Add interval option to driftfile directive
- Add waitsynced and waitunsynced options to local directive
- Add sanity checks for integer values in configuration
- Add support for systemd Type=notify service
- Add RTC refclock driver
- Allow PHC refclock to be specified with network interface name
- Don’t require multiple refclock samples per poll to simplify filter configuration
- Keep refclock reachable when dropping samples with large delay
- Improve quantile-based filtering to adapt faster to larger delay
- Improve logging of selection failures
- Detect clock interference from other processes
- Try to reopen message log (-l option) on cyclelogs command
- Fix sourcedir reloading to not multiply sources
- Fix tracking offset after failed clock step
- Drop support for NTS with Nettle < 3.6 and GnuTLS < 3.6.14
- Drop support for building without POSIX threads

Signed-off-by: Liu Yiding <liuyd.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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