Type mismatch: cannot convert from Instant to DateTime.

[Noriyuki TAKEI]

Hi
Maybe stupid question :)

I'm developing module that enhancing the function of shibboleth as an
external Java project with testbed.

At first, testbed worked fine.However, the following error occurred
suddenly in many projects,for example,idp-attribute-filter-impl,idp-core
and so on.

Type mismatch: cannot convert from Instant to DateTime.

I'll show you the one(net.shibboleth.idp.installer.
TestMetadataGenerator.java) of many codes at which the above-mentioned
error occurs.

final DateTime validUntil = entity.getValidUntil();

I guess the type of validUntil is DateType and the type of the return value
form getValidUntil method is Instant.

Probably, I found this error in almost all the codes where DateTime
converts Instant.

My environment is as follows:
- OS
Mac OS Mojave.

- Java Version:
$ java -version
java version "11.0.2" 2019-01-15 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.2+9-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.2+9-LTS, mixed mode)
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