ovs: fix build error. (bsd/porting/networking.cc)

do not need initialize variable. (or use memset(3) for zero clear.)
Because set of values by ioctl(SIOCGIFFLAGS)

```
(snip)
  CC bsd/sys/kern/sys_socket.o
  CC bsd/sys/kern/subr_disk.o
  CC bsd/porting/route.o
  CXX bsd/porting/networking.o
../../bsd/porting/networking.cc: In function ‘int osv::ifup(std::string)’:
 ../../bsd/porting/networking.cc:99:30: error: missing braces around
initializer for ‘char [16]’ [-Werror=missing-braces]
cc1plus: all warnings being treated as errors
make[1]: *** [bsd/porting/networking.o] Error 1
make[1]: Leaving directory
`/home/kouki-o/work/kaishuu0123-osv/build/release'
make: *** [all] Error 2
(snip)
```

Signed-off-by: Kouki Ooyatsu <kaishuu0123@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
Fix make flag in readme for debug mode

The -j must have been included by mistake, otherwise make uses unlimited
jobs.

Signed-off-by: David Leifker <dlei...@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>