Use wfShellExec() in UIDGenerator and style fixes.

Replaced backtick commands with wfShellExec() so that
the proper shell timeouts are applied. Also made some
minor style changes (added spaces after casting, got
rid of vertical alignment).

Change-Id: I9a8e9cb689279881f7bdea281c0107d613c3a7a8
Merge "Use wfShellExec() in UIDGenerator and style fixes."