Add git to CentOS 6 images on x86 (i386) and x86_64

centos6_x64/Dockerfile

@@ -19,7 +19,7 @@ RUN sed -i s%mirrorlist=http%#mirrorlist=http%g /etc/yum.repos.d/CentOS-Base.rep
  && yum --setopt=tsflags=nodocs -y upgrade \
  && yum --setopt=tsflags=nodocs -y install devtoolset-7 cmake3 \
  && yum --setopt=tsflags=nodocs -y install jemalloc-devel zlib-devel bzip2-devel lz4-devel snappy-devel libzstd-devel \
- && yum --setopt=tsflags=nodocs -y install openssl java-1.8.0-openjdk-devel wget \
+ && yum --setopt=tsflags=nodocs -y install openssl java-1.8.0-openjdk-devel git wget \
  && yum -y clean all \
  && alternatives --install /usr/local/bin/cmake cmake /usr/bin/cmake 10 --slave /usr/local/bin/ctest ctest /usr/bin/ctest --slave /usr/local/bin/cpack cpack /usr/bin/cpack --slave /usr/local/bin/ccmake ccmake /usr/bin/ccmake \
  && alternatives --install /usr/local/bin/cmake cmake /usr/bin/cmake3 20 --slave /usr/local/bin/ctest ctest /usr/bin/ctest3 --slave /usr/local/bin/cpack cpack /usr/bin/cpack3 --slave /usr/local/bin/ccmake ccmake /usr/bin/ccmake3 \

centos6_x86/Dockerfile

@@ -20,7 +20,7 @@ RUN curl --fail https://vault.centos.org/6.10/os/i386/Packages/udev-147-2.73.el6
  && linux32 yum --setopt=tsflags=nodocs -y reinstall udev.i686 util-linux-ng.i686 \
  && linux32 yum --setopt=tsflags=nodocs -y update \
  && linux32 yum --setopt=tsflags=nodocs -y install epel-release \
- && linux32 yum --setopt=tsflags=nodocs -y install wget tar which \
+ && linux32 yum --setopt=tsflags=nodocs -y install git wget tar which \
  && linux32 yum --setopt=tsflags=nodocs -y install make perl devtoolset-8 cmake3 \
  && linux32 yum --setopt=tsflags=nodocs -y install jemalloc-devel zlib-devel bzip2-devel lz4-devel snappy-devel libzstd-devel \
  && linux32 yum --setopt=tsflags=nodocs -y install openssl java-1.8.0-openjdk-devel \