remove star imports

Change-Id: I48e97406a115208d5e9ab1eed3127997f3aa331c
drop unused tables

Change-Id: I0bd2c03bde8f977c31a5dab77e86463581364fab
convert model.py from module into package

Change-Id: I4624dd729ca87e6183695a5183b347073be11260
split out SQL utilities and base classes

Change-Id: I84f56dca28b7ec01d3cb658beb67036590beabc7
split out database type definitions

Change-Id: Ifdb5d1b6855733b0edb903ecefd47e2f20599120
split out Activity base class

Change-Id: I700b0455559c65af684895f5affeecef0bfe0de6
split out ConfigItem

Change-Id: Ic0cdd9ecb1b6a6faba4db62c2885bd6c7a5652bd
split out User, Group, and related classes

Change-Id: Ic4d425e990f8851f5846a99f14dfe0035cc2a9ed
split out LabController and related classes

Change-Id: I586071216e26cc3f9bdb5cd64e8efdab65e4480b
split out distro library classes

Change-Id: I5b92563e7dc1336778a18082c353ade75f4620a4
split out task library classes

Change-Id: Ice46319de62e4a72f6ae235035a8e1fff1a4d02f
split out VirtManager

Change-Id: Ie0e04113ae2831d10d29d0f683d210d0b65c41c3
split out System and related classes

Change-Id: I809b7cd2fd768cf7ae924a94b3c5befd5f07e0a4
split out scheduler-related classes

Change-Id: I2bdc8959344f055dde0e0b285213eea9e9835603