Merge pull request #12998 from Liuchang0812/wip-11081

common: fix that $host always expands to localhost instead of actual hostname

Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/CMakeLists.txt
Simple merge

diff --cc src/common/config_opts.h
Simple merge

diff --cc src/test/common/CMakeLists.txt
Simple merge