Problem : rpl.rpl_insert_id fails on PB2 everyday and only on solaris
          platform. The problem was that the thread_stack value available
          for the test seems to be less when the test executes on the 
          solaris machines. 
          On other platforms the default value 196608 for 32 bit machines
          and 262144 bytes for 64 big machines seems to be enough.
          But on linux the error reports that the the thread_stack value
          required is beyond the specified limit on the respective
          platforms.

Fix - The problem is fixed by passing the PB_HOST_SPECIFIC_MYSQLD_ARGS
      host specific arguments to the slave.