patches: Correct default value in 'patches list --help'

The default format for 'patches list' is 'full', not
'oneline'; correct the help text.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
list: Display info about series version, RFC status, etc

Extend the 'patches list' 'full' format output to include a
Tags: line for each series which gives the following info:
 * patch series version (if not v1)
 * whether this is a pullreq
 * any for-release-X info
 * if patch series is marked as an RFC

The Tags: line is omitted if it would be empty.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
apply: add Message-id and SoB to merged pull requests

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>