enable jenkinsfile and groovy filetype; and gitcommit for git commit --amend

[marslo]

Requirements (please check off with 'x')

• I have read the Contributing Guidelines
• I have read or at least glanced at the FAQ
• I have read or at least glanced at the Wiki

What does this Pull Request (PR) do?

to enable the new filetype: groovy and jenkinsfile

How should this be manually tested?

• open vim

• verify via set filetype ( airline won't be updated timely )

  • groovy : set ft=groovy or set ft=Groovy
  • jenkinsfile: set ft=jenkinsfile or set ft=Jenkinsfile

• verify via create new file ( airline will be updated )

  • groovy: touch a.groovy
  • jenkinsfile: touch a.jenkinsfile

Any background context you can provide?

• Jenkinsfile Unicode: E66E
• Groovy Unicode: E775

What are the relevant tickets (if any)?

N/A

Screenshots (if appropriate or helpful)

• groovy
  

• jenkinsfile
  

• gitcommit