python-common: replace types for extra_*_args with ArgSpec based types

python-common: replace types for extra_*_args with ArgSpec based types

Use the ArgSpec, ArgumentList, and GeneralArgList types throughout
the deployment module to support extra_container_args and
extra_entrypoint_args. The GeneralArgList type supports all possible
input forms while ArgumentList reflects the internal representation
of the argument lists.

Signed-off-by: John Mulligan <jmulligan@redhat.com>