Why does --upload-tools now append a .1 build revision ?

[David Cheney]

ubuntu at juju-hpgoctrl2-machine-0:~$ juju bootstrap -v --upload-tools
2013/04/18 01:57:18 INFO environs/openstack: opening environment "goscale2"
2013/04/18 01:57:22 INFO environs/tools: built 1.9.15.1-precise-amd64
(2193kB)
2013/04/18 01:57:22 INFO environs/tools: uploading 1.9.15.1-precise-amd64
2013/04/18 01:57:22 INFO environs/openstack: bootstrapping environment
"goscale2"
2013/04/18 01:57:32 INFO environs: reading tools with major version 1
2013/04/18 01:57:32 INFO environs: filtering tools by series: precise
2013/04/18 01:57:32 INFO environs: filtering tools by version: 1.9.15.1
2013/04/18 01:57:32 WARNING environs/openstack: ignoring constraints,
using default-instance-type flavor "standard.small"
2013/04/18 01:57:32 WARNING environs/openstack: forcing precise/amd64
tools for image "68481"
2013/04/18 01:57:37 INFO environs/openstack: started instance "1518355"
ubuntu at juju-hpgoctrl2-machine-0:~$ grep 'const version' src/*/*/*/*
src/launchpad.net/juju-core/version/version.go:const version = "1.9.15"