swift cli does not support ':' in metadata values

The swift cli does not set a maxsplit value when parsing through the metadata options. All characters after the first ':' in a metadata value are ignored.

For example:

swift post -m 'web-listings-css: https://example.com/fancy.css' documents

Results in the following metadata set on the container:

Meta Web-Listings-Css: https

The code to be changed is in st_post in 3 locations. Here is an example for the container split:

for item in options.meta:
       split_item = item.split(':')
       headers['X-Container-Meta-' + split_item[0]] = \
             len(split_item) > 1 and split_item[1]

item.split(':') should be changed to item.split(':',1)