zebra: Adjust column display of `show zebra client summ` for openfabric

zebra: Adjust column display of `show zebra client summ` for openfabric

The openfabric daemon has a longer name than anticipated for
`show zebra client summary` adjust to allow it to fit without
making columns all blomped.

Before:
robot# show zebra client summ
Name      Connect Time    Last Read  Last Write  IPv4 Routes       IPv6 Routes
--------------------------------------------------------------------------------
static        00:00:06     00:00:06    00:00:06       4/0              0/0
openfabric      00:00:06     00:00:06    00:00:06       0/0              0/0

After:

[sharpd@robot frr4]$ vtysh -c "show zebra client summ"
Name      Connect Time    Last Read  Last Write  IPv4 Routes       IPv6 Routes
--------------------------------------------------------------------------------
static        00:02:16     00:02:16    00:02:16       4/0              0/0
openfabric    00:02:16     00:02:16    00:02:16       0/0              0/0

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>