KNOX-1608: Remove gateway-adapter module (#1263)

(cherry picked from commit 67fb077)

Author: arunk-kumar

.github/workflows/build/conf/topologies/knoxldap.xml

@@ -27,7 +27,7 @@ limitations under the License.
 			</param>
 			<param>
 				<name>main.ldapRealm</name>
-				<value>org.apache.hadoop.gateway.shirorealm.KnoxLdapRealm</value>
+				<value>org.apache.knox.gateway.shirorealm.KnoxLdapRealm</value>
 			</param>
 			<param>
 				<name>main.ldapRealm.userDnTemplate</name>

build-tools/src/main/resources/build-tools/spotbugs-filter.xml

@@ -70,11 +70,6 @@ limitations under the License.
     <Class name="org.apache.knox.gateway.shell.jdbc.KnoxLine" />
     <Bug pattern="SQL_INJECTION_JDBC" />
   </Match>
-  
-  <Match>
-    <Class name="~org.apache.hadoop.gateway..*" />
-    <Bug pattern="NM_SAME_SIMPLE_NAME_AS_SUPERCLASS" />
-  </Match>
 
   <Match>
     <Class name="org.apache.knox.gateway.performance.test.PerformanceTestConfiguration" />