Add to pass rivilege level when installing service app.

Add to pass rivilege level when installing service app.

[Issue#] N/A
[Problem] If hybrid app singined public app, installation success like having platform privilege.
[Cause] wrt-installer doesn't pass signature info when service app install.
[Solution] add to pass parameter about privilege level during install hybrid app.

0: NP, 1: Public, 2: Partner, 3: Platform
wrt-installer -iv [path] -p 1

[SCMRequest] N/A

Change-Id: I4d288f7d346fafe77eebbd6cb548c5ae5284b085