Remove handling of deprecated variable docker_pkg_name

[haxorof]

Because Docker now separated the cli into a separate package since 18.09 the docker_pkg_name cannot handle this and is replaced by docker_version which handle it in a bit smarter way.

ansible-role-docker-ce/tests/test_old_version.yml

Lines 7 to 11 in 31db975

	- name: Install Docker CE 17.06 (using docker_pkg_name)
	include_role:
	name: haxorof.docker_ce
	vars:
	docker_pkg_name: docker-ce-17.06.0.ce-1.el7.centos

ansible-role-docker-ce/tasks/main.yml

Lines 80 to 84 in e16e8fe

	- name: Temporary handling of deprecated variable docker_pkg_name
	set_fact:
	docker_version: "{{ docker_pkg_name | regex_replace('^docker-ce.(.+)$', '\\1') }}"
	when: docker_pkg_name is match('docker-ce' + docker_os_pkg_version_separator[_docker_os_dist])
	tags: ["install", "configure", "postinstall", "docker_install", "docker_configure", "docker_postinstall"]

ansible-role-docker-ce/defaults/main.yml

Lines 11 to 13 in ea01711

	# Docker package to install. Change this if you want a specific version of Docker
	# DEPRECATED! use docker_version instead
	docker_pkg_name: docker-ce