Change the execution order of tasks that create unitadmin_account

[KourokiTakuto]

Overview
Required unitadmin_account is not created if optional task fails

Hot Fixes
If an optional task fails, it is better to generate logs and messages (how to solve the problem) and proceed to the next task.

Repletion
The current vagrant carries out the following optional tasks (Git cloning, construction, deployment) separately from the existing ansible.
httpclient ← Required
mailsender ← Option
slack messenger ← Required
ew services ← Required
unit-manager ← Option
Other apps ← Option

[dixonsiu]

Changing the order will not solve similar problem. It should be done the right way.

Suggestion

1. Execute an optional task and check the result.
2. If it fails, produce log and message (how to fix the problem).
3. Execute other task.

Advance
Should use the Cell Import feature to setup the App Cell.

[KourokiTakuto]

Since we modified the App cell to use cell import function, correspondence of advance part is unnecessary.
https://github.com/personium/setup-vagrant/pull/28/files

[KourokiTakuto]

The option or required is described below:

1. httpclient : Required
2. mailsender : Optional
3. slack messenger : Required
4. ew services : Required
5. unit-manager : Optional
6. Other application : Optional