优化V4升级安装docker和docker compose。 #538
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1.升级docker原版本中,在install_docker中做了判断如果在/usr/local/bin/docker如果存在则直接退出。取消这里的判断。
2.升级docker compose也是有类似判断,进行优化,并且升级docker compose时没有调用install docker compose,进行优化。