pip: allow versions starting with v

[techsk8]

I'm using packages that have gitlab tags starting with v1.7.0 and currently the case it's not covered.

  python::pip { 'ipmigrate_ice_service_cli':
    ensure       => 'v1.7.0',
    install_args => '-U',
    pkgname      => 'instance-service-cli',
    virtualenv   => '/opt/ipmigrate',
    url          => 'git+ssh://git@gitlab.myorg.com/project-group/instance-service-cli.git',
    timeout      => 30,
    require      => Python::Pyvenv['/opt/ipmigrate'],
    before       => Exec['install_pip_ipmigrate'],
  }

currently I get: ensure can be a version number or one of: present, absent, latest.

[kenyon]

Can you please also add a test to https://github.com/voxpupuli/puppet-python/blob/master/spec/defines/pip_spec.rb which uses a version number starting with a v? Other than that, this seems fine to me. 👍

[techsk8]

Opened #727 with a proper branch name. Closing this one.

[kenyon]

For future reference, branch name doesn't matter, so no need to create a new PR because of that.