enginx: consolidate conf.d file

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
rename sample config

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
etc: fix conf filename

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
postgresql/postgis version change

Signed-off-by: Hiroshi Miura <miurahr@linux.com>