Cleanup docker before 2.3.0b1 release scripts/Docker/Dockerfile Document/implement pip_sdist source mode for testing the source distribution. Change from multiple if's to case statement. Disable verbose tracing of shells script. Use --build-arg="VERBOSE=1" to enable set -xv. scripts/Docker/roundup_start Report error if demo mode is used with 2.2.0. This catches the easiest case where build is done using pypi before 2.3.0 final is released. Indent demo mode PORT_8080 doc block so it's not lost in a wall of text. doc/installation.txt Document all source --build-args including how to build from pypi using a version specifier. Break out other uses of --build-arg into code blocks. Reference docker compose section rather than referencing docker-compose.yml. Clarify docker hub tagging for devel releases. Minor formatting fixes.

''' Wrapper for getargspec to support other callables and python 3 support

In python 3 just uses getfullargspec which handles regular functions
and classes with __call__ methods.
'''

try:
    # Python 3+
    from inspect import getfullargspec as getargspec
    findargspec = getargspec
except ImportError:
    # Python 2.5-2.7 modified from https://bugs.python.org/issue20828
    import inspect

    def findargspec(fn):
        if inspect.isfunction(fn) or inspect.ismethod(fn):
            inspectable = fn
        elif inspect.isclass(fn):
            inspectable = fn.__init__
        elif callable(fn):
            inspectable = fn.__call__
        else:
            inspectable = fn

        try:
            return inspect.getargspec(inspectable)
        except TypeError:
            raise