   Fix java_home and other 6.8 bugs

    Fixes:
    1.  BZ 1306989 - Crash seen with pki-common pkg during IPA server install
        Crash in upgrade script occurs because prior to configuration,
        CS.cfg has lines that are comments and that do not parse neatly
        into a foo=bar pattern.  Now, we will ignore comments and blank lines.

    2.  BZ 1290535 - Check for incompatible Java at startup
        The bulk of this change.  Sets the JAVA_HOME to the 1.7.0 JRE.
        rather than relying on alternatives.  Also includes migration script
        for existing instances.

    3.  BZ1313207 - ca.subsystem.certreq missing from CS.cfg
        certreq is not really needed right now for the upgrade scripts.
        This will ignore the error if it is not present.

Please review,

Ade