Harden tests sun/security/x509/URICertStore/ExtensionsWithLDAP.java and krb5/canonicalize/Test.java

Certain JVM tools may access InetAddress and initialise its static members during start-up resulting in a NameService configuration being already set to the default PlatformNameService, causing issues in the following tests which expects the use of HostsFileNameService instead:
sun/security/krb5/canonicalize/Test.java and sun/security/x509/URICertStore/ExtensionsWithLDAP.java


ExtensionsWithLDAP.java log file snippet:

----------System.err:(13/936)----------
java.lang.RuntimeException: The ldap.host.for.crldp from CRLDP extension is not requested
at ExtensionsWithLDAP.main(ExtensionsWithLDAP.java:174)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:831)

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canonicalize/Test.java log file snippet:

----------System.err:(14/816)----------
java.lang.Exception: Output is host/c1@THIS.REALM
at Test.check(Test.java:65)
at Test.main(Test.java:44)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:831)

JavaTest Message: Test threw exception: java.lang.Exception: Output is host/c1@THIS.REALM
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