Created by: haosanzi

• Add running rune on ubuntu 18.04-server in running_rune_with_occlum.md
• Add installing rune and occlum-pal with package in running_rune_with_occlum.md
• Update Dockerfile in running_rune_with_occlum.md
• Update the the path of enclave.runtime and rune in running_rune_with_occlum.md
• Update the "enclave.runtime.path" in running_rune_with_occlum_bundle.md

Signed-off-by: shirong shirong@linux.alibaba.com Signed-off-by: Yilin Li YiLin.Li@linux.alibaba.com