wic: Integrated plugin docstrings into 'wic help plugins' output

Added mechanism to show docstrings of plugin classes as a part of
plugins help page.
For missing plugins the following warning message is shown:
<class '<plugin class spec>'> is missing docstring.

[YOCTO #7118]

(From OE-Core rev: 0997208266686473d23aed0fab58a1fd7c5d8cae)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/wic b/scripts/wic
index cf968591e2..dda72a9c27 100755
--- a/scripts/wic
+++ b/scripts/wic
@@ -277,7 +277,7 @@ subcommands = {
                   hlp.wic_list_help],
     "plugins":   [wic_help_topic_subcommand,
                   wic_help_topic_usage,
-                  hlp.wic_plugins_help],
+                  hlp.get_wic_plugins_help()],
     "overview":  [wic_help_topic_subcommand,
                   wic_help_topic_usage,
                   hlp.wic_overview_help],