Refactoring of LRMS shell backends processing flow
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This merge request is automatically copied from !196 (merged) orginally made by @andrii
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This changeset modifies the general call stack used by shell backends.
Changeset introduces lrms_common.sh
that is single place for declaring the grami/arc.conf parsing functions and common env settings.
This includes fix for configuration options processing by LRMS backends [BUGZ 3717]
Changes are documented in README.lrms.rst