Add support for floats in "since" kwarg on logs().

[mccalluc]

The documentation is clear:

since (datetime or int) – Show logs since a given datetime or integer epoch

but it's easy for someone to overlook that and pass in something based on a float from time.time() and since will just be ignored. Would a PR that supported any number or a datetime be welcome?

django-docker-engine==0.0.1
docker==2.1.0
docker-pycreds==0.2.1
Python 2.7.13 :: Continuum Analytics, Inc.
Client:
 Version:      17.03.0-ce
 API version:  1.26
 Go version:   go1.7.5
 Git commit:   60ccb22
 Built:        Thu Feb 23 10:40:59 2017
 OS/Arch:      darwin/amd64

Server:
 Version:      17.03.0-ce
 API version:  1.26 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   3a232c8
 Built:        Tue Feb 28 07:52:04 2017
 OS/Arch:      linux/amd64
 Experimental: true

[shin-]

Yes - I agree it shouldn't be ignored. Raising an error if a float is provided would be the appropriate course of action.

[fopinappb]

I know this has been closed long time ago, but maybe it should be revisited as apparently the API does support floats (for added - and useful - precision).

moby/moby#41784 (comment)