Fix testcase failures in MongoDBIT

[emeroad]

06-02 22:59:54.054 [:child:8 Thread] ERROR d.f.e.p.r.Starter                       : 68 -- prepare executable
java.nio.file.FileSystemException:                         embedmongo/extracted/Linux-B64--3.4.1/extractmongod -> /tmp/extract-37c92f9f-9123-4aea-a8d9-88cf928e5b87extractmongod: No space left on device
	at sun.nio.fs.UnixException.translateToIOException(UnixException.java:91) ~[?:1.8.0_312]
	at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102) ~[?:1.8.0_312]
	at sun.nio.fs.UnixCopyFile.copyFile(UnixCopyFile.java:253) ~[?:1.8.0_312]
	at sun.nio.fs.UnixCopyFile.copy(UnixCopyFile.java:581) ~[?:1.8.0_312]
	at sun.nio.fs.UnixFileSystemProvider.copy(UnixFileSystemProvider.java:253) ~[?:1.8.0_312]
	at java.nio.file.Files.copy(Files.java:1274) ~[?:1.8.0_312]
	at de.flapdoodle.embed.process.extract.ExtractedFileSets.copy(ExtractedFileSets.java:55) ~[de.flapdoodle.embed.process-2.0.1.jar:?]
	at de.flapdoodle.embed.process.store.ExtractedArtifactStore.extractFileSet(ExtractedArtifactStore.java:110) ~[de.flapdoodle.embed.process-2.0.1.jar:?]
	at de.flapdoodle.embed.process.runtime.Starter.prepare(Starter.java:57) [de.flapdoodle.embed.process-2.0.1.jar:?]
	at de.flapdoodle.embed.process.runtime.Starter.prepare(Starter.java:49) [de.flapdoodle.embed.process-2.0.1.jar:?]
	at com.navercorp.pinpoint.plugin.mongodb.MongoDBITBase.startDB(MongoDBITBase.java:103) [test-classes/:?]
	at com.navercorp.pinpoint.plugin.mongodb.MongoDBITBase.testConnection(MongoDBITBase.java:140) [test-classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_312]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_312]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_312]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_312]