IMPALA-3405: [DOCS] Pare down upgrading section
IMPALA-3405: [DOCS] Pare down upgrading section

Physically remove the CM upgrading instructions
and the yum, zypper, apt-get procedure too.
Replace with a reference to rebuilding and redeploying,
via instructions on the Apache Impala wiki.

Change-Id: I41f34772200b22d176cf41a7e7ecedc3f3904b6a
Reviewed-on: http://gerrit.cloudera.org:8080/6008
Tested-by: Impala Public Jenkins
Reviewed-by: John Russell <308573a947c636ab812b35943b6242633bef8113@cloudera.com>

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