MANIFEST.in: fix up to address warning

> warning: manifest_maker: MANIFEST.in, line 4: 'recursive-include' expects <dir> <pattern1> <pattern2> ...
> warning: no previously-included files matching '*' found under directory 'doc/build/*/'

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
packege: rpmlint warning

ryu.noarch: E: non-executable-script /usr/lib/python2.7/site-packages/ryu/tests/unit/lib/test_hub.py 0644L /usr/bin/env
ryu.noarch: E: non-executable-script /usr/lib/python2.7/site-packages/ryu/lib/hub.py 0644L /usr/bin/env

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
man: remove man page of ryu client

ryu-client isn't installed any more as it has been moved to ryu/tests.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>