Remove PGO and duplicated code from build scripts

We had four scripts doing roughly the same thing - calling cmake and
then calling make_impala.sh. This patch pushes the cmake call into
make_impala.sh and then changes make_[asan|debug|release].sh to be
trivial one-line calls into make_impala.sh.

This patch also removes the PGO build, which is no longer used and no
longer worked.

Change-Id: Ib5c8ba910e52b030c172678f86db7d56e3f8c306
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3001
Reviewed-by: Henry Robinson <henry@cloudera.com>
Tested-by: jenkins
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3621