[FLINK-8011][dist] Set flink-python to provided

This closes apache#4973.

flink-dist/pom.xml

@@ -97,12 +97,6 @@ under the License.
  <version>${project.version}</version>
  </dependency>
 
- <dependency>
- <groupId>org.apache.flink</groupId>
- <artifactId>flink-python_${scala.binary.version}</artifactId>
- <version>${project.version}</version>
- </dependency>
-
  <dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-scala-shell_${scala.binary.version}</artifactId>
@@ -263,6 +257,14 @@ under the License.
  <!-- end optional Flink metrics reporters -->
 
  <!-- start optional Flink libraries -->
+
+ <dependency>
+ <groupId>org.apache.flink</groupId>
+ <artifactId>flink-python_${scala.binary.version}</artifactId>
+ <version>${project.version}</version>
+ <scope>provided</scope>
+ </dependency>
+
  <dependency>
  <groupId>org.apache.flink</groupId>
  <artifactId>flink-cep_${scala.binary.version}</artifactId>
@@ -485,7 +487,6 @@ under the License.
  </filters>
  <artifactSet>
  <excludes>
- <exclude>org.apache.flink:flink-python_${scala.binary.version}</exclude>
  <exclude>org.slf4j:slf4j-log4j12</exclude>
  <exclude>log4j:log4j</exclude>
  </excludes>

flink-dist/src/main/assemblies/bin.xml

@@ -39,7 +39,6 @@ under the License.
  <useTransitiveFiltering>true</useTransitiveFiltering>
 
  <includes>
- <include>org.apache.flink:flink-python_${scala.binary.version}</include>
  <include>org.slf4j:slf4j-log4j12</include>
  <include>log4j:log4j</include>
  </includes>
@@ -184,6 +183,16 @@ under the License.
  </includes>
  </fileSet>
 
+ <!-- copy python jar -->
+ <fileSet>
+ <directory>../flink-libraries/flink-python/target</directory>
+ <outputDirectory>lib</outputDirectory>
+ <fileMode>0644</fileMode>
+ <includes>
+ <include>flink-python_${scala.binary.version}-${project.version}.jar</include>
+ </includes>
+ </fileSet>
+
  <!-- copy python package -->
  <fileSet>
  <directory>../flink-libraries/flink-python/src/main/python/org/apache/flink/python/api</directory>