add yosemite to macOSXSeries
Prevent destroy-environment when desired.
Fixed error construction and format. Renamed vars for clarity and conformity.
Cleaned up error-related code based on review.
Made code readable
Merge branch 'master' into allocateaddress-maas
Initial skeleton of AllocateAddress for maas
Merge branch 'master' into allocateaddress-maas
Complete AllocateAddress first cut
Update comment
Merge branch 'master' into allocateaddress-maas
Environment variable manipulation is behind cmds for block/unblock operation.
Code readability improvement.
Merge branch 'master' of https://github.com/juju/juju into allocateaddress-maas
Renaming after switch from ListNetworks to Subnets
Return nil on success
Error handling
Correct operation for reserving an ip address with maas
Skeleton test for AllocateAddress
Extending tests