ntp: Add missing 'ntp' static group id

This fixes build in reproducible test environment [0]:
ERROR: ntp-4.2.8p17-r0 do_install: ExecutionError[...]
| chown: invalid group: ‘ntp:ntp’

Also add a missing newline at end-of-file.

[0]: https://autobuilder.yoctoproject.org/typhoon/#/builders/155/builds/12/steps/28/logs/stdio line 12221

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/files/static-group-meta-networking

@@ -12,3 +12,4 @@ rwhod:x:641:
 lldpd:x:642:
 opensaf:x:643:
 radiusd:x:651:
+ntp:x:653:

meta-networking/files/static-passwd-meta-networking

@@ -12,8 +12,8 @@ opensaf:x:643:643::/:/bin/nologin
 tinyproxy:x:650:nogroup::/:/bin/nologin
 radiusd:x:651:radiusd::/:/bin/nologin
 nm-openconnect:x:652:nogroup::/:/bin/nologin
-ntp:x:653:nogroup::/:/bin/nologin
+ntp:x:653:ntp::/:/bin/nologin
 nm-fortisslvpn:x:654:nogroup::/:/bin/nologin
 nm-openvpn:x:655:nogroup::/:/bin/nologin
 squid:x:656:nogroup::/:/bin/nologin
-mosquitto:x:657:nogroup::/:/bin/nologin
+mosquitto:x:657:nogroup::/:/bin/nologin