Revert "install script: replace package installation commands for autotest-install-package-deps"

This reverts commit d41d8a31724faea534908f28c920617891b42338.

The procedure outlined at
https://github.com/autotest/autotest/wiki/AutotestServerInstallScript

demands that the server install script is fairly self
contained, since at the beginning, there's still no
autotest clone in place, so the special script doesn't
exist, so no package install whatsoever will take place.

So restore the old code to install packages.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
install-autotest-server.sh: Update package list

Now that we have autotest-install-packages-deps, we
can call it right after autotest is installed.
This way, we can still ensure that all packages are
current and no sync mistake was made.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>