Description of problem:
Internal Server Error while cancelling errata deployment

Version-Release number of selected component (if applicable):
2.2

How reproducible:
1. schedule errata to be applied with large number of systems.
In this case 1500
2. cancel the deployment via the schedule screen
3. confirm cancel
4. error is raised

Actual results:
internal server error is raised

Expected results:
cancel errata deployment

Additional info:
tomcat localhost.log
SEVERE: Servlet.service() for servlet action threw exception
java.sql.SQLSyntaxErrorException: ORA-01795: maximum number of expressions in a list is 1000

        at oracle.jdbc.driver.T2CConnection.checkError(T2CConnection.java:765)
        at oracle.jdbc.driver.T2CConnection.checkError(T2CConnection.java:662)
        at oracle.jdbc.driver.T2CPreparedStatement.executeForDescribe(T2CPreparedStatement.java:546)
        at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1167)
        at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3584)
        at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3628)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1493)
        at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:440)
        at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:186)
        at org.hibernate.loader.Loader.getResultSet(Loader.java:1787)
        at org.hibernate.loader.Loader.doQuery(Loader.java:674)
        at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
        at org.hibernate.loader.Loader.doList(Loader.java:2220)
        at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
        at org.hibernate.loader.Loader.list(Loader.java:2099)
        at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
        at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
        at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
        at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
        at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
        at com.redhat.rhn.domain.kickstart.KickstartFactory.failKickstartSessions(KickstartFactory.java:1080)
        at com.redhat.rhn.manager.action.ActionManager.cancelAction(ActionManager.java:275)
        at com.redhat.rhn.manager.action.ActionManager.cancelActions(ActionManager.java:234)
        at com.redhat.rhn.frontend.action.schedule.PendingActionsDel