Fix for bug #3715. Properly process configuration sections separator in gridftpd.

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This merge request is automatically copied from !109 (merged) orginally made by @aleksandr.konstantinov
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Fix for bug #3715 (http://bugzilla.nordugrid.org/show_bug.cgi?id=3715). Properly process configuration sections separator in gridftpd.

Fixes processing of [authgroup] sections and possible some other too for gridftpd.