LU-9897 tests: add generated files to .gitignore

Several binaries and wrappers are created in the build process
that show up as files for git add which is not the case. Add
these files to .gitignore so avoid an accidental git addition.

Test-Parameters: trivial
Change-Id: If693ba7933c0329a333dec71ed6fb521a90435f4
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/44778
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Tested-by: Maloo <maloo@whamcloud.com>