Description of problem:
Unexpected symbols in any of the fields on Provisioning -> Power Management page leads to an ISE and traceback in catalina.out.

Version-Release number of selected component (if applicable):
spacewalk-backend-2.2.43-1.el6.noarch (Satellite 5.7/Spacewalk 2.2)

How reproducible:
always

Steps to Reproduce:
1. prepare Satellite 5.7 with power management support enabled (fence-agents installed)
2. register client to the Satellite, add provisioning entitlement
3. fill in the values in <system> -> Provisioning -> Power management
4. put some unexpected symbols (like ;) into any of the fields -> ISE
   * e.g. System identifier: '-P ; echo "sth"'

Actual results:
ISE + traceback in catalina.out:
[...]
2014-08-04 08:49:53,374 [TP-Processor8] WARN  org.apache.struts.action.RequestProcessor - Unhandled Exception thrown: class org.cobbler.XmlRpcException
2014-08-04 08:49:53,374 [TP-Processor8] ERROR com.redhat.rhn.frontend.servlets.SessionFilter - Error during transaction. Rolling back
javax.servlet.ServletException: org.cobbler.XmlRpcException: XmlRpcException calling cobbler.
        at org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:520)
[...]
Caused by: org.cobbler.XmlRpcException: XmlRpcException calling cobbler.
        at org.cobbler.CobblerConnection.invokeMethod(CobblerConnection.java:120)
        at org.cobbler.CobblerConnection.invokeTokenMethod(CobblerConnection.java:150)
        at org.cobbler.SystemRecord.invokeModify(SystemRecord.java:216)
        at org.cobbler.CobblerObject.modify(CobblerObject.java:149)
        at org.cobbler.SystemRecord.setPowerId(SystemRecord.java:589)
        at com.redhat.rhn.manager.kickstart.cobbler.CobblerPowerSettingsUpdateCommand.store(CobblerPowerSettingsUpdateCommand.java:133)
        at com.redhat.rhn.frontend.action.kickstart.PowerManagementAction.execute(PowerManagementAction.java:95)
        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
        ... 40 more
Caused by: redstone.xmlrpc.XmlRpcFault: <class 'cobbler.cexceptions.CX'>:'Invalid characters found in input'
        at redstone.xmlrpc.XmlRpcClient.handleResponse(XmlRpcClient.java:443)
        at redstone.xmlrpc.XmlRpcClient.endCall(XmlRpcClient.java:376)
        at redstone.xmlrpc.XmlRpcClient.invoke(XmlRpcClient.java:165)
        at org.cobbler.CobblerConnection.invokeMethod(CobblerConnection.java:117)
        ... 47 more
[...]

Expected results:
no ISE, warning about unexpected symbols in the form

Additional info: