juju test suite fails if bzr whoami is unset

[Aaron Bentley]

The juju test suite should not be affected by the user's configuration, but the user bzr configuration can break it.
The tests should create a skeleton bzr configuration and define the BZR_HOME environment variable.

$make check
go test launchpad.net/juju-core/...
warning: building out-of-date packages:
 launchpad.net/goyaml
 labix.org/v2/mgo/bson
 launchpad.net/loggo
 labix.org/v2/mgo
 labix.org/v2/mgo/txn
 launchpad.net/tomb
 code.google.com/p/go.net/websocket
 launchpad.net/gocheck
 launchpad.net/gnuflag
 code.google.com/p/go.crypto/openpgp/errors
 code.google.com/p/go.crypto/openpgp/armor
 code.google.com/p/go.crypto/cast5
 code.google.com/p/go.crypto/openpgp/elgamal
 code.google.com/p/go.crypto/openpgp/s2k
 code.google.com/p/go.crypto/openpgp/packet
 code.google.com/p/go.crypto/openpgp
 code.google.com/p/go.crypto/openpgp/clearsign
 launchpad.net/gwacl/fork/tls
 launchpad.net/gwacl/fork/http
 launchpad.net/gwacl/logging
 launchpad.net/gwacl
 launchpad.net/goamz/aws
 launchpad.net/goamz/ec2
 launchpad.net/goamz/s3
 launchpad.net/golxc
 launchpad.net/gomaasapi
 launchpad.net/goose/errors
 launchpad.net/goose
 launchpad.net/goose/http
 launchpad.net/goose/identity
 launchpad.net/goose/sync
 launchpad.net/goose/client
 launchpad.net/goose/nova
 launchpad.net/goose/swift
 launchpad.net/goamz/ec2/ec2test
 launchpad.net/goamz/s3/s3test
 launchpad.net/goose/testservices/hook
 launchpad.net/goose/testservices/identityservice
 launchpad.net/goose/testservices
 launchpad.net/goose/testservices/novaservice
 launchpad.net/goose/testservices/swiftservice
 launchpad.net/goose/testservices/openstackservice
 launchpad.net/lpad
installing these packages with 'go test -i launchpad.net/juju-core/...' will speed future tests.

ok launchpad.net/juju-core/agent 1.828s
ok launchpad.net/juju-core/agent/tools 0.712s

----------------------------------------------------------------------
FAIL: bzr_test.go:59: BzrSuite.TestCommit

bzr_test.go:66:
    c.Assert(err, gc.IsNil)
... value *errors.errorString = &errors.errorString{s:"error running \"bzr commit\": bzr: ERROR: Unable to determine your name.\nPlease, set your name with the 'whoami' command.\nE.g. bzr whoami \"Your Name <email address hidden>\"\nexit status 3"} ("error running \"bzr commit\": bzr: ERROR: Unable to determine your name.\nPlease, set your name with the 'whoami' command.\nE.g. bzr whoami \"Your Name <email address hidden>\"\nexit status 3")

----------------------------------------------------------------------
FAIL: bzr_test.go:77: BzrSuite.TestPush

bzr_test.go:92:
    c.Assert(err, gc.IsNil)
... value *errors.errorString = &errors.errorString{s:"error running \"bzr commit\": bzr: ERROR: Unable to determine your name.\nPlease, set your name with the 'whoami' command.\nE.g. bzr whoami \"Your Name <email address hidden>\"\nexit status 3"} ("error running \"bzr commit\": bzr: ERROR: Unable to determine your name.\nPlease, set your name with the 'whoami' command.\nE.g. bzr whoami \"Your Name <email address hidden>\"\nexit status 3")