Add support for conf.d subfolder (#1902)

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* cmake changes to support conf.d

* php changes to support conf.d

* perl changes to support conf.d

* C changes to support conf.d

* add conf.d support to rpmspecfile

* fix typo

* specify ZM_CONFIG_SUBDIR in relevant target distros

* put back my config_file perl definition

* remove quotes from ZM macros

* fix snprintf

* add README to conf.d folder

* adjust rpm specfile

* remove custom permissions from README in rpmspecfile

* modify rpm README documentation to reflect conf.d support

* set ZM_CONFIG_SUBDIR in debian rules file

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