fix system tests (elastic#10422)

packages/hadoop/_dev/deploy/docker/Dockerfile

@@ -4,6 +4,7 @@ COPY ./files/yml /opt/hadoop/etc/hadoop
 COPY ./files/environment.sh environment.sh
 COPY ./files/wordcount.jar wordcount.jar
 COPY ./files/start.sh /opt/hadoop/start.sh
+COPY ./files/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo
 
 RUN sudo yum install openssh-server openssh-clients -y;\
     sudo ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key;\

packages/hadoop/_dev/deploy/docker/files/CentOS-Base.repo

@@ -0,0 +1,24 @@
+[base]
+name=CentOS-$releasever - Base
+baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[updates]
+name=CentOS-$releasever - Updates
+baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[extras]
+name=CentOS-$releasever - Extras
+baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
+
+[centosplus]
+name=CentOS-$releasever - Plus
+baseurl=http://vault.centos.org/7.9.2009/centosplus/$basearch/
+gpgcheck=1
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7