Author: Scott Moser
Author Date: 2018-12-14 21:41:52 UTC

vmtest: Fix bug preventing explicit disabling of system_upgrade.

There was no way to avoid enabling system_upgrade, as the code would
simply do a truish test on the value of the environment variable, and:
   bool("false") == True.

When testing with a single proposed upgrade as in:
   CURTIN_VMTEST_ADD_REPOS=proposed
   CURTIN_VMTEST_UPGRADE_PACKAGES=open-iscsi

The normal behavior if CURTIN_VMTEST_ADD_REPOS has a value should be to
enable system_upgrade, but in this case we only want the single package
upgraded.

So now the environment can explicitly set that off with:
   CURTIN_VMTEST_SYSTEM_UPGRADE=false

Author: Ryan Harper
Author Date: 2018-12-06 18:11:37 UTC

releasing curtin version 18.2-0ubuntu1

Author: Scott Moser
Author Date: 2018-10-12 20:30:34 UTC

releasing curtin version 18.1-59-g0f993084-0ubuntu1~18.04.1

Author: Scott Moser
Author Date: 2018-10-12 20:23:49 UTC

releasing curtin version 18.1-59-g0f993084-0ubuntu1~16.04.1

Author: Ryan Harper
Author Date: 2018-10-10 16:22:55 UTC

releasing curtin version 18.1-59-g0f993084-0ubuntu1

Author: Ryan Harper
Author Date: 2018-05-18 19:02:29 UTC

releasing curtin version 18.1-17-gae48e86f-0ubuntu1~17.10.1

Author: Scott Moser
Author Date: 2017-12-19 18:34:42 UTC

Import version 0.1.0~bzr532-0ubuntu1~17.04.1