ansible: don't depend on :python.

Use the system Python instead.
appscale-tools: don't depend on :python.

Use the system Python instead.
atdtool: don't depend on :python.

Use the system Python instead.
aubio: don't depend on :python.

Use the system Python instead.
awscli: don't depend on :python.

Use the system Python instead.
cantera: don't depend on :python.

Use the system Python instead.
charm-tools: don't depend on :python.

Use the system Python instead.
cookiecutter: don't depend on :python.

Use the system Python instead.
cookiecutter: add test.
deheader: don't depend on :python.

Use the system Python instead.
disco: don't depend on :python.

Use the system Python instead.
disco: add test.
bottle_version: parse disco bottle versions.
dtrx: don't depend on :python.

Use the system Python instead.
duplicity: don't depend on :python.

Use the system Python instead.
euca2ools: don't depend on :python.

Use the system Python instead.
googlecl: don't depend on :python.

Use the system Python instead.
hg-flow: don't depend on :python.

Use the system Python instead.
ice: don't depend on :python.

Use the system Python instead.
ice: add test.