Also rename 'ubuntu16.4' to 'ubuntu 16.04' in filename.
Both new Dockerfiles built smoothly on x86_64 CentOS 7.8.2003 with docker 19.03.15, and pushed as poanpan/mlnx_ofed_linux-5.3-1.0.0.1-centos7.9 and poanpan/mlnx_ofed_linux-5.3-1.0.0.1-ubuntu18.04.
Also rename 'ubuntu16.4' to 'ubuntu 16.04' in filename.
Both new Dockerfiles built smoothly on x86_64 CentOS 7.8.2003 with docker 19.03.15, and pushed as
poanpan/mlnx_ofed_linux-5.3-1.0.0.1-centos7.9
andpoanpan/mlnx_ofed_linux-5.3-1.0.0.1-ubuntu18.04
.