Remove known references to internal architechture from the Impala respository.
Remove known references to internal architechture from the Impala respository.

Change-Id: I7a160d00937cd4b5ceab5ce8493740569142702a
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4928
Reviewed-by: Skye Wanderman-Milne <6d4b168ab637b0a20cc9dbf96abb2537f372f946@cloudera.com>
Reviewed-by: Ippokratis Pandis <49df5a81b84182d67af5e425b1c52ae595fc1f17@cloudera.com>
Tested-by: jenkins

ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC