python: modify python.manifest to work for new case folder name
python: modify python.manifest to work for new case folder name

weeks ago, the python folder name was changed to pythonruntime,
only the fulltest.manifest files were modified. Now, modify the
python.manifest.

Signed-off-by: Zhang Jingke <0979c04a6d09a3b3c8dd699e3664fb112fdd2a5b@intel.com>

wanghongjuan/meta-iotqa-1,wanghongjuan/meta-iotqa-1,daweiwu/meta-iotqa-1,wanghongjuan/meta-iotqa-1,ostroproject/meta-iotqa,daweiwu/meta-iotqa-1,daweiwu/meta-iotqa-1,daweiwu/meta-iotqa-1,wanghongjuan/meta-iotqa-1,ostroproject/meta-iotqa,ostroproject/meta-iotqa,daweiwu/meta-iotqa-1,wanghongjuan/meta-iotqa-1,ostroproject/meta-iotqa,ostroproject/meta-iotqa