[hotfix] Remove unnecessary logs to pass official image ci tests.

This applies #51 to 1.12.0.

This closes #52
diff --git a/1.12/scala_2.11-java11-debian/docker-entrypoint.sh b/1.12/scala_2.11-java11-debian/docker-entrypoint.sh
index a83e2a2..65f8fc8 100755
--- a/1.12/scala_2.11-java11-debian/docker-entrypoint.sh
+++ b/1.12/scala_2.11-java11-debian/docker-entrypoint.sh
@@ -102,7 +102,6 @@
       echo "Disable Jemalloc as the memory allocator"
       _args=("${_args[@]:1}")
   else
-      echo "Enable Jemalloc as the memory allocator via appending env variable LD_PRELOAD with /usr/lib/x86_64-linux-gnu/libjemalloc.so"
       export LD_PRELOAD=$LD_PRELOAD:/usr/lib/x86_64-linux-gnu/libjemalloc.so
   fi
 }
@@ -183,5 +182,5 @@
 . $FLINK_HOME/bin/config.sh
 export FLINK_CLASSPATH="`constructFlinkClassPath`:$INTERNAL_HADOOP_CLASSPATHS"
 
-echo "Running command in pass-through mode: ${args[@]}"
+# Running command in pass-through mode
 exec $(drop_privs_cmd) "${args[@]}"
diff --git a/1.12/scala_2.11-java8-debian/docker-entrypoint.sh b/1.12/scala_2.11-java8-debian/docker-entrypoint.sh
index a83e2a2..65f8fc8 100755
--- a/1.12/scala_2.11-java8-debian/docker-entrypoint.sh
+++ b/1.12/scala_2.11-java8-debian/docker-entrypoint.sh
@@ -102,7 +102,6 @@
       echo "Disable Jemalloc as the memory allocator"
       _args=("${_args[@]:1}")
   else
-      echo "Enable Jemalloc as the memory allocator via appending env variable LD_PRELOAD with /usr/lib/x86_64-linux-gnu/libjemalloc.so"
       export LD_PRELOAD=$LD_PRELOAD:/usr/lib/x86_64-linux-gnu/libjemalloc.so
   fi
 }
@@ -183,5 +182,5 @@
 . $FLINK_HOME/bin/config.sh
 export FLINK_CLASSPATH="`constructFlinkClassPath`:$INTERNAL_HADOOP_CLASSPATHS"
 
-echo "Running command in pass-through mode: ${args[@]}"
+# Running command in pass-through mode
 exec $(drop_privs_cmd) "${args[@]}"
diff --git a/1.12/scala_2.12-java11-debian/docker-entrypoint.sh b/1.12/scala_2.12-java11-debian/docker-entrypoint.sh
index a83e2a2..65f8fc8 100755
--- a/1.12/scala_2.12-java11-debian/docker-entrypoint.sh
+++ b/1.12/scala_2.12-java11-debian/docker-entrypoint.sh
@@ -102,7 +102,6 @@
       echo "Disable Jemalloc as the memory allocator"
       _args=("${_args[@]:1}")
   else
-      echo "Enable Jemalloc as the memory allocator via appending env variable LD_PRELOAD with /usr/lib/x86_64-linux-gnu/libjemalloc.so"
       export LD_PRELOAD=$LD_PRELOAD:/usr/lib/x86_64-linux-gnu/libjemalloc.so
   fi
 }
@@ -183,5 +182,5 @@
 . $FLINK_HOME/bin/config.sh
 export FLINK_CLASSPATH="`constructFlinkClassPath`:$INTERNAL_HADOOP_CLASSPATHS"
 
-echo "Running command in pass-through mode: ${args[@]}"
+# Running command in pass-through mode
 exec $(drop_privs_cmd) "${args[@]}"
diff --git a/1.12/scala_2.12-java8-debian/docker-entrypoint.sh b/1.12/scala_2.12-java8-debian/docker-entrypoint.sh
index a83e2a2..65f8fc8 100755
--- a/1.12/scala_2.12-java8-debian/docker-entrypoint.sh
+++ b/1.12/scala_2.12-java8-debian/docker-entrypoint.sh
@@ -102,7 +102,6 @@
       echo "Disable Jemalloc as the memory allocator"
       _args=("${_args[@]:1}")
   else
-      echo "Enable Jemalloc as the memory allocator via appending env variable LD_PRELOAD with /usr/lib/x86_64-linux-gnu/libjemalloc.so"
       export LD_PRELOAD=$LD_PRELOAD:/usr/lib/x86_64-linux-gnu/libjemalloc.so
   fi
 }
@@ -183,5 +182,5 @@
 . $FLINK_HOME/bin/config.sh
 export FLINK_CLASSPATH="`constructFlinkClassPath`:$INTERNAL_HADOOP_CLASSPATHS"
 
-echo "Running command in pass-through mode: ${args[@]}"
+# Running command in pass-through mode
 exec $(drop_privs_cmd) "${args[@]}"