Merge r1772489, r1772504 from trunk:

The default value of 'inherit' should be AP_LUA_INHERIT_UNSET.
With this value, the behavior is the same as 'parent-first' in the 'LuaInherit' directive

If not explicitelly initialized, its value is 0 because of the 'apr_calloc 'in 'create_dir_config'. 0 means 'AP_LUA_INHERIT_NONE'

PR 60419

Missing CHNAGES for r1772489
Submitted by: jailletc36
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1772922 13f79535-47bb-0310-9956-ffa450edef68