KAFKA-20645: Move LogLoaderTest to storage module (apache#22426)

Also delete LogTestUtils.scala as it's not used anymore

Reviewers: Ken Huang <s7133700@gmail.com>, TengYao Chi
 <frankvicky@apache.org>, majialong <majialoong@gmail.com>

Author: mimaison

checkstyle/suppressions.xml

@@ -311,7 +311,8 @@
     <suppress checks="ImportControl" files="TransactionsExpirationTest.java"/>
     <suppress checks="ImportControl" files="TransactionsTest.java"/>
     <suppress checks="ImportControl" files="TransactionsWithMaxInFlightOneTest.java"/>
-    <suppress checks="(NPathComplexity|ClassDataAbstractionCoupling|ClassFanOutComplexity|JavaNCSS|MethodLength)" files="LogCleanerTest.java"/>
+    <suppress checks="(NPathComplexity|ClassDataAbstractionCoupling|ClassFanOutComplexity|JavaNCSS|MethodLength)" files="(LogCleanerTest|LogLoaderTest).java"/>
+    <suppress checks="ParameterNumber" files="LogTestUtils.java"/>
 
     <!-- benchmarks -->
     <suppress checks="(ClassDataAbstractionCoupling|ClassFanOutComplexity)"