debian, cmake: Prepare release 2.5.0

This commit prepares build system for building lizardfs-2.5.0 packets.
Changes include:
* renaming debian packages from mfs-* to lizardfs-*
* lizardfs-adm debian package added
* version changed to 2.5.0
* services renamed from mfs-* to lizardfs-*, eg.
    service mfs-master start
  is now:
    service lizardfs-master start

Change-Id: I590c0ba3909624b7ba74391cda90219bdafdf73a