timedated: support multiple NTP services

Support for alternative NTP services was dropped by b72ddf0f4f.
This makes timedated re-support alternative NTP services.

Closes #8402. Also, fixes #1329.
This commit is contained in:
Yu Watanabe
2018-04-17 14:09:13 +09:00
parent e9e5ea880a
commit 5d280742b6

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