UI: deploy and update vm instances with extraconfig

[weizhouapache]

vm extra config is supported since cloudstack 4.12 (see PR #3510)
However, there is no UI support for it.

• deploy vm with extra config
• update vm with extra config

ISSUE TYPE

• Improvement Request

COMPONENT NAME

UI

CLOUDSTACK VERSION

CONFIGURATION

OS / ENVIRONMENT

SUMMARY

STEPS TO REPRODUCE

EXPECTED RESULTS

ACTUAL RESULTS