Minor formatting fix

Hi Markus,

To be consistent in viewstat output a space should be added after the 
colon when reporting the svn revision.

Sample viewstat output:
-------------------------------------------------------------------------------
refdba: viewstat
You are served by: refdb 0.9.8-pre9
SVN revision:253
Client IP: 127.0.0.1
Connected via sqlite driver (dbd_sqlite v0.8.1)
to: 2.8.17
db version: 2
serverip: localhost
timeout: 180
dbs_port:
logfile: /var/log/refdbd.log
logdest: FILE
loglevel: INFO
remoteadmin: off
pidfile: /var/run/refdbd.pid
999:1
-------------------------------------------------------------------------------

Regards,
David.

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