RFR(xs) 8186988: use log_warning() and log_error() instead of tty->print_cr for CDS warning and error messages

[Calvin Cheung]

bug: https://bugs.openjdk.java.net/browse/JDK-8186988

webrev: http://cr.openjdk.java.net/~ccheung/8186988/webrev.00/

Please review this simple change for replacing the use of tty->print_cr 
with log_waring(cds) for CDS warning messages and with log_error(cds) 
for error messages.

Ran tier1 - 3 testing.

thanks,

Calvin