Handle this.

This since NTP status is polled in yangerd.

Slightly slower to detect changes

This is to force yangerd to repoll polled things

FRR can sometimes be pretty slow to actually install the route in
the kernel. Increase the timeout of must_reach.

Instead of relying of the runtime xpath, which can be just /system-state
for example, resulting on no yangerd match.

Int => int64

RAUC downloads the upgrade bundle to /tmp (tmpfs) before installing.
With a ~175 MB bundle, a 384 MB DUT runs out of memory mid-upgrade and
the OOM killer takes out random daemons.  Bump to 512 MB.

Signed-off-by: Mattias Walström <lazzer@gmail.com>

Talk chronyd's native monitoring protocol over its Unix command
socket instead of forking chronyc four times per poll and parsing CSV.
Typed replies via github.com/facebook/time/ntp/chrony.  The Unix
socket, not UDP, is required for serverstats (PERMIT_AUTH in chronyd).

Also fixes three bugs in the CSV parsing:

 - packet-sent/packet-sent-fail actually reported chrony's
   authenticated and interleaved packet counters; chronyd does not
   count sent packets, so drop them
 - clock-refid truncated the sync source address to four characters
   ("192."); now the full IPv4 address, the numeric refid for IPv6
   (as a JSON number, the uint32 union member libyang accepts), or
   the pseudo-IP for non-printable refids like the local reference
 - a stopped chronyd could leave a phantom {"port": ...} subtree
   from the ss listening-port probe

Signed-off-by: Mattias Walström <lazzer@gmail.com>

Replace the yanger pmc-based collector with a native monitor talking
the PTP management protocol on each ptp4l instance's Unix socket.
Reactive rather than polled: SUBSCRIBE_EVENTS_NP makes ptp4l push port
state changes, per-sync-cycle time status, and parent data set changes;
the near-static data sets refresh on a slow timer that also renews the
subscription.  Queries are served from the cached tree, no forking pmc.

Management requests carry the instance's transportSpecific nibble;
without it ptp4l silently drops them on gPTP (802.1AS) instances.

Signed-off-by: Mattias Walström <lazzer@gmail.com>