Added pt-show-grants tool to mysqlclient

pt-show-grants tool is added to the mysqlclient utility
image for the Mariadb grants dump.

Change-Id: I16bcd91319e4c810cd63fb9b72919bf677cc8632

images/mysqlclient-utility/Dockerfile.ubuntu_bionic

@@ -21,6 +21,8 @@ RUN set -xe \
        rsyslog \
        pwgen \
        curl \
+       libdbi-perl \
+       libdbd-mysql-perl \
        moreutils \
        mysql-client \
        python3.6 \
@@ -35,6 +37,8 @@ RUN set -xe \
     && curl -sSL https://dl.k8s.io/v${KUBE_VERSION}/kubernetes-client-linux-amd64.tar.gz | tar -zxv --strip-components=1 \
     && mv ${TMP_DIR}/client/bin/kubectl /usr/bin/kubectl \
     && chmod +x /usr/bin/kubectl \
+    && curl --silent -L https://percona.com/get/percona-toolkit.tar.gz \
+       | tar -C /usr/local/bin/ -zv --strip-components=2 --wildcards -x "*/*/pt-show-grants" \
     && rm -rf \
       ${TMP_DIR} \
       /tmp/* \