mockftpserver: Remove pom.xml files am: 1fcee32776 am: 6944975bdd am: 59fc86a72d am: ad0dc47c99 am: f3a44d2454

Original change: https://android-review.googlesource.com/c/platform/external/mockftpserver/+/1817967

Change-Id: I8d876bbee3c06a3fa536ca14aa22b8bacc476ffc