mksahakyan

addapt dCache pool to accordingly to Filesystem's READ-ONLY mode

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#9270: Is it possible to start a pool w/o its metadata DB? (https://rt.dcache.org/Ticket/Display.html?id=9270) ticket closed and ticket https://rt.dcache.org/Ticket/Display.html?id=10540

Admin log in will return, permition denied, if the `etc/dcache/htpasswd` contains empty lines at the begining of the file. The password will not be recognize.

TPC-Pull transfer fails (from different remote sites) that ended with return code 10027.

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pool accumulates new zero-size files, all of which were produced by a failed TPC-Pull transfer (from different remote sites) that ended with return code 10027.

PLEASE DON"T MERGE THIS IS A TEST