Do not trigger DNS in *SearchPipeTest

[Akron]

Kustvakt version
0.67

Describe the bug
When running the test suite in an environment with problematic DNS resolution, the test suite fails.

To Reproduce
Use a problematic test environment. That's not too easy to reproduce, but for example the IDS-Gast environment fails to resolve problematic domain names like glemm and unknown.

Expected behavior
The DNS should not be triggered and the test suite should run through.

Desktop (please complete the following information):

• OS: Linux

[Akron]

The error persists:

[ERROR] Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 1.407 s <<< FAILURE! -- in de.ids_mannheim.korap.web.controller.SearchNetworkEndpointTest
[ERROR] de.ids_mannheim.korap.web.controller.SearchNetworkEndpointTest.testSearchWithUnknownHost -- Time elapsed: 0.607 s <<< FAILURE!
org.opentest4j.AssertionFailedError: expected: <118> but was: <201>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:158)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:139)
	at org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:201)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:152)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:147)
	at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:558)
	at de.ids_mannheim.korap.web.controller.SearchNetworkEndpointTest.testSearchWithUnknownHost(SearchNetworkEndpointTest.java:109)

[ERROR] Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.460 s <<< FAILURE! -- in de.ids_mannheim.korap.web.lite.SearchNetworkEndpointTest
[ERROR] de.ids_mannheim.korap.web.lite.SearchNetworkEndpointTest.testSearchWithUnknownHost -- Time elapsed: 0.158 s <<< FAILURE!
org.opentest4j.AssertionFailedError: expected: <118> but was: <201>
	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:158)
	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:139)
	at org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:201)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:152)
	at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:147)
	at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:558)
	at de.ids_mannheim.korap.web.lite.SearchNetworkEndpointTest.testSearchWithUnknownHost(SearchNetworkEndpointTest.java:108)