Fix missing renames of Bootstrap.list_bootstraps -> Bootstrap.all_bootstraps

[touilleMan]

Fixes p4a bootstrap command:

$ p4a bootstraps
Traceback (most recent call last):
  File "/home/touilleman/projects/buildozer-test/venv/bin/p4a", line 10, in <module>
    sys.exit(main())
  File "/home/touilleman/projects/buildozer-test/venv/lib/python3.7/site-packages/pythonforandroid/entrypoints.py", line 18, in main
    ToolchainCL()
  File "/home/touilleman/projects/buildozer-test/venv/lib/python3.7/site-packages/pythonforandroid/toolchain.py", line 671, in __init__
    getattr(self, args.subparser_name.replace('-', '_'))(args)
  File "/home/touilleman/projects/buildozer-test/venv/lib/python3.7/site-packages/pythonforandroid/toolchain.py", line 788, in bootstraps
    for bs in Bootstrap.list_bootstraps():
AttributeError: type object 'Bootstrap' has no attribute 'list_bootstraps'

[opacam]

Thanks!! 😄,

Do you mind to rename as well this list_bootstraps entry 😬?

[opacam]

LGTM 👍

Note: it would be awesome if we could change the docstring I mentioned before in this PR, so we could have all the renames of list_boostraps concentrated at same PR.

[touilleMan]

@opacam I've update my PR to correct the docstring ;-)

[opacam]

👍

Thanks again!!! 😄