[rfc][icedtea-web] change FILElogs contnet

[Jiri Vanek]

In messages properties:

-FILElogs=(may be set to different location by you) contains file log files (if enabled). 
itw-cplugin-date_time.log for native part of plugin, itw-javantx-date_time.log for everything else.
+FILElogs=contains file log files (if enabled).  itw-cplugin-date_time.log for native part of 
plugin, itw-javantx-date_time.log for everything else.


Removed (may be set to different location by you)

Now the output looks like:
  - (may be set to different location by you) contains file log files (if enabled). 
itw-cplugin-date_time.log for native part of plugin, itw-javantx-date_time.log for everything else. 
Controlled by deployment.user.logdir

As Controlled by deployment.user.logdir is geenrated automatically, the preamble had no effect.

Ok for head?

J.