Added source interface support for NTP.
Also made NTP start on Mgmt-VRF by default when configured.
**- How I did it**
1) Updated hostcfg to listen to global config NTP and NTP_SERVER tables and restart ntp when ever the configuration changes. NTP table includes source interface configuration.
2) The ntp script updated to by default start on Mgmt-VFT when configured.
Signed-off-by: Prabhu Sreenivasan <prabhu.sreenivasan@broadcom>
- create a file in files/image_config/ntp/ntp-systemd-wrapper to add mgmt vrf related start cmd for ntp service. So that the default /usr/lib/ntp/ntp-systemd-wrapper can be overriden during build time.
- modify build_debian.sh to cp files/image_config/ntp/ntp-systemd-wrapper to /usr/lib/ntp/ntp-systemd-wrapper during build time.
Co-authored-by: Bing Sun <Bing_Sun@dell.com>
