Bug 879920

Description of problem:

when upgrade is failing in a critical point whereas it can't automatically roll-back, a link to proper documentation should be prompted on how\what steps should be performed.
such knowledge does exists in upgrade scripts code, thus, it wasn't prompted in any kind (due to exception i guess).

MSG_ERROR_UPGRADE_30 = "\n **Error: Upgrade failed **\n\
In order to restore the previous installation, perform the following steps: \n\
1. Make sure that there are no EAP6 packages on the system:\n\
\trpm -qa | grep ep6\.el6\n\
If there are such packages, remove them:\n\
\tyum remove `rpm -qa | grep ep6\.el6`\n\
2. Make sure that rhevm or its dependencies are not installed:\n\
\trpm -qa | grep rhevm \n\
If they are still installed, remove them:\n\
\tyum remove `rpm -qa | grep rhevm`\n\
3. Disable EAP6 channel, otherwise you will experience dependency resolution problems.\n\
4. Install rhevm-3.0 from the RHEL channel. For example, use the following command:\n\
\tyum install %s\n\
5. Rename DB if it is present:\n\
\tpsql -U postgres --list\n\
If 'rhevm' DB exists, rename it:\n\
\tpsql -U postgres -c \"ALTER DATABASE rhevm RENAME TO rhevm_old;\"\n\
6. Run rhevm-setup using the answer file located at " + basedefs30.ANSWER_FILE + ":\n\
\trhevm-setup --answer-file=" + basedefs30.ANSWER_FILE + "\n\
7. Remove the DB created by the setup:\n\
\tservice jbossas stop\n\
\tdropdb -U postgres rhevm\n\
8. Restore the production DB using the backup file by running the following commands: \n\
\tpsql -U postgres -f %s \n\
\tpsql -U postgres -c \"ALTER DATABASE engine RENAME TO rhevm;\"\n\
9. Restore security certificates and configs using the following command: \n\
\ttar jxvfP " + basedefs30.OLD_VERSION_FILES + " \n\
10. Start jboss service using the following command: \n\
\tservice jbossas start\n"