Py3 shenanigans

Earthfile

@@ -23,13 +23,9 @@ os-one:
  sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-Linux-*
  RUN dnf install -y dnf-plugins-core
  RUN dnf config-manager --set-enabled powertools
- RUN yum -y install epel-release
- RUN dnf install -y \
- ca-certificates
- ELSE
- RUN yum install -y --setopt=skip_missing_names_on_install=False \
- ca-certificates
  END
+ RUN yum install -y --setopt=skip_missing_names_on_install=False \
+ ca-certificates
  ELSE
  RUN DEBIAN_FRONTEND=noninteractive \
  apt-get update && apt-get install -y --no-install-recommends \
@@ -45,7 +41,13 @@ deps-one:
 
  IF [ "${DISTRO}" = "centos" ]
  RUN curl -O https://rpm.frrouting.org/repo/frr-stable-repo-1-0.el7.noarch.rpm && \
- yum install -y ./frr-stable*
+ yum install -y ./frr-stable* && \
+ yum install -y --setopt=skip_missing_names_on_install=False \
+ librtr-devel libyang2-devel
+
+ RUN yum install -y --setopt=skip_missing_names_on_install=False \
+ epel-release
+
  RUN yum install -y --setopt=skip_missing_names_on_install=False \
  git cmake \
  autoconf automake \
@@ -65,14 +67,12 @@ deps-one:
  libssh libssh-devel \
  libunwind-devel \
  systemd-devel \
- libyang2-devel \
- librtr-devel
+ python3 python3-devel python3-sphinx
  IF [ "${RELEASE}" = "7" ]
- RUN yum install -y --setopt=skip_missing_names_on_install=False \
- pytest python-devel python-sphinx
+ RUN pip3 install pytest
  ELSE
  RUN yum install -y --setopt=skip_missing_names_on_install=False \
- python3 python3-pytest python3-devel python3-sphinx
+ python3-pytest
  END
 
  ELSE