Fix could not get sources warnings while compiling

[INFO] --- maven-shade-plugin:3.1.1:shade (default) @ hudi-hadoop-mr-bundle ---
[INFO] Including org.apache.hudi:hudi-common:jar:0.5.2-SNAPSHOT in the shaded jar.
Downloading from aliyun: http://maven.aliyun.com/nexus/content/groups/public/org/apache/hudi/hudi-common/0.5.2-SNAPSHOT/hudi-common-0.5.2-SNAPSHOT-sources.jar
Downloading from cloudera: https://repository.cloudera.com/artifactory/cloudera-repos/org/apache/hudi/hudi-common/0.5.2-SNAPSHOT/hudi-common-0.5.2-SNAPSHOT-sources.jar
Downloading from confluent: https://packages.confluent.io/maven/org/apache/hudi/hudi-common/0.5.2-SNAPSHOT/hudi-common-0.5.2-SNAPSHOT-sources.jar
Downloading from libs-milestone: https://repo.spring.io/libs-milestone/org/apache/hudi/hudi-common/0.5.2-SNAPSHOT/hudi-common-0.5.2-SNAPSHOT-sources.jar
Downloading from libs-release: https://repo.spring.io/libs-release/org/apache/hudi/hudi-common/0.5.2-SNAPSHOT/hudi-common-0.5.2-SNAPSHOT-sources.jar
Downloading from apache.snapshots: https://repository.apache.org/snapshots/org/apache/hudi/hudi-common/0.5.2-SNAPSHOT/hudi-common-0.5.2-SNAPSHOT-sources.jar
[WARNING] Could not get sources for org.apache.hudi:hudi-common:jar:0.5.2-SNAPSHOT:compile
[INFO] Excluding com.fasterxml.jackson.core:jackson-annotations:jar:2.6.7 from the shaded jar.
[INFO] Excluding com.fasterxml.jackson.core:jackson-databind:jar:2.6.7.1 from the shaded jar.
[INFO] Excluding com.fasterxml.jackson.core:jackson-core:jar:2.6.7 from the shaded jar.
[INFO] Excluding org.apache.httpcomponents:fluent-hc:jar:4.3.2 from the shaded jar.
[INFO] Excluding commons-logging:commons-logging:jar:1.1.3 from the shaded jar.
[INFO] Excluding org.apache.httpcomponents:httpclient:jar:4.3.6 from the shaded jar.
[INFO] Excluding org.apache.httpcomponents:httpcore:jar:4.3.2 from the shaded jar.
[INFO] Excluding commons-codec:commons-codec:jar:1.6 from the shaded jar.
[INFO] Excluding org.rocksdb:rocksdbjni:jar:5.17.2 from the shaded jar.
[INFO] Including com.esotericsoftware:kryo-shaded:jar:4.0.2 in the shaded jar.
[INFO] Including com.esotericsoftware:minlog:jar:1.3.0 in the shaded jar.
[INFO] Including org.objenesis:objenesis:jar:2.5.1 in the shaded jar.