Configuration file improvments

[Nicklas Nordborg]

Reggie currently include a configuration file for Open Grid Scheduler hosts (reggie-ogs-hosts.xml). In the future (eg. for #674) we probably want to store configuration settings that are not related to the Open Grid system.

I think the configuration file should be changed to reggie-config.xml instead. The <ogs-hosts> tag should be renamed to <remote-hosts> tag. A "type" attribute should be used to specify what the remote host is used for (eg. type="ogs").

[Nicklas Nordborg]

(In [2859]) References #679: Configuration file improvments

Renamed configuration file to reggie-config.xml and <ogs-hosts> to <remote-hosts type="ogs">. Other hosts can be configured but are currently not parsed or usable.

[Nicklas Nordborg]

(In [2860]) References #679: Configuration file improvments

Load non-grid host as well. They are still handled by OpenGridService and OpenGridServlet.

[Nicklas Nordborg]

(In [2861]) References #679: Configuration file improvments

Moved some functionality in OpenGridService and OpenGridServlet to RemoteHostServlet.

[Nicklas Nordborg]

(In [2875]) References #679: Configuration file improvments

Fixes an issue with re-loading and re-installing Reggie that caused Tomcat to stop with a PermGen space error.

Configuration re-loading now always go through the OpenGridService instance.

[Nicklas Nordborg]

(In [2892]) References #679: Configuration file improvments

Updates for better handling of missing and incorrect configuration file.

[Nicklas Nordborg]

(In [2893]) References #679: Configuration file improvments

Also detect configuration file problem in the installation wizard.

[Nicklas Nordborg]

(In [2976]) References #679: Configuration file improvments

Error message was hidden behind tables with items.