SMF service instance change in Oracle Solaris 11.4 SRU 45.119.2

[Kristijan]

Oracle Solaris 11.4 SRU 45.119.2 adds a new SMF service for NTP monitoring svc:/network/ntp:monitor.

This results in the ntp module failing with the following error:

Error: /Stage[main]/Ntp::Service/Service[ntp]: Could not evaluate: Failed to get the FMRI of the network/ntp service: The pattern 'network/ntp' matches multiple FMRIs! These are the FMRIs it matches: svc:/network/ntp:default, svc:/network/ntp:monitor

This change updates ntp::service_name to specifically reference the default instance.

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[github-actions]

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[smortex]

Not tested (not running this OS) but seems legit.

Fixes #645

[pmcmaw]

Thanks for this @Kristijan :-)