update server configure file on pack stage

ci/jenkins/step/package.groovy

 timeout(time: 5, unit: 'MINUTES') {
+    dir ("ci/jenkins/scripts") {
+        sh "pip3 install -r requirements.txt"
+        sh "./yaml_processor.py merge -f /opt/milvus/conf/server_config.yaml -m ../yaml/update_server_config.yaml -i && rm /opt/milvus/conf/server_config.yaml.bak"
+    }
     sh "tar -zcvf ./${PROJECT_NAME}-${PACKAGE_VERSION}.tar.gz -C /opt/ milvus"
     withCredentials([usernamePassword(credentialsId: "${params.JFROG_CREDENTIALS_ID}", usernameVariable: 'JFROG_USERNAME', passwordVariable: 'JFROG_PASSWORD')]) {
         def uploadStatus = sh(returnStatus: true, script: "curl -u${JFROG_USERNAME}:${JFROG_PASSWORD} -T ./${PROJECT_NAME}-${PACKAGE_VERSION}.tar.gz ${params.JFROG_ARTFACTORY_URL}/milvus/package/${PROJECT_NAME}-${PACKAGE_VERSION}.tar.gz")

ci/jenkins/yaml/update_server_config.yaml

+db_config:
+  primary_path: /opt/milvus

docker/build_env/ubuntu16.04/Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends wget && \
     sh -c 'echo deb https://apt.repos.intel.com/mkl all main > /etc/apt/sources.list.d/intel-mkl.list' && \
     apt-get update && apt-get install -y --no-install-recommends \
     git flex bison gfortran lsb-core \
-    curl libtool automake libboost1.58-all-dev libssl-dev pkg-config libcurl4-openssl-dev \
+    curl libtool automake libboost1.58-all-dev libssl-dev pkg-config libcurl4-openssl-dev python3-pip \
     clang-format-6.0 clang-tidy-6.0 \
     lcov mysql-client libmysqlclient-dev intel-mkl-gnu-2019.4-243 intel-mkl-core-2019.4-243 && \
     apt-get remove --purge -y && \

docker/build_env/ubuntu18.04/Dockerfile

@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends wget && \
     sh -c 'echo deb https://apt.repos.intel.com/mkl all main > /etc/apt/sources.list.d/intel-mkl.list' && \
     apt-get update && apt-get install -y --no-install-recommends \
     git flex bison gfortran lsb-core \
-    curl libtool automake libboost-all-dev libssl-dev pkg-config libcurl4-openssl-dev \
+    curl libtool automake libboost-all-dev libssl-dev pkg-config libcurl4-openssl-dev python3-pip \
     clang-format-6.0 clang-tidy-6.0 \
     lcov mysql-client libmysqlclient-dev intel-mkl-gnu-2019.4-243 intel-mkl-core-2019.4-243 && \
     apt-get remove --purge -y && \