Description:
THREAD_CONCURRENCY is deprecated and there is no 
deprecation warning message while setting this variable
while starting the server.

Analysis:
This variable is specific to Solaris 8 and earlier systems
and is ignored on all other platforms. But since many 
customers, who uses other than Solaris, still has this 
variable in their configuration file, it is important to
have a deprecation warning.

Fix:
THREAD_CONCURRENCY deprecation warning message is added.