[luci] [PATCH] Prevent multiple instances of luci-apps in ucitrack

[Lars Hardy]

  When updating the firmware from LuCI  and keep the configuration 
files, both luci09 and Trunk adds a new entry in the 
"/etc/config/ucitrack". (for those luci-applications that use ucitrack)
So when upgrading the firmware several times my /etc/config/ucitrac 
looked like this:

config 'ushare'
         option 'init' 'ushare'

config 'freifunk_p2pblock'
         option 'init' 'freifunk-p2pblock'

config 'p910nd'
         option 'init' 'p910nd'

config 'ushare'
         option 'init' 'ushare'

config 'freifunk_p2pblock'
         option 'init' 'freifunk-p2pblock'

config 'p910nd'
         option 'init' 'p910nd'

config 'ushare'
         option 'init' 'ushare'

config 'freifunk_p2pblock'
         option 'init' 'freifunk-p2pblock'

config 'p910nd'
         option 'init' 'p910nd'

config 'ushare'
         option 'init' 'ushare'

config 'freifunk_p2pblock'
         option 'init' 'freifunk-p2pblock'

config 'p910nd'
         option 'init' 'p910nd'

config 'ushare'
         option 'init' 'ushare'

This leads to multiple starts/processes of each app.
Attached a patch that applies to both luci-09 and Trunk.
I don't know if this is the right way to fix it,  I just borrowed the 
code from luci-statistics app that does not do this.

Regards Lars
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