Fixed for spacing between lines in table is getting preserve.

Problem Description:
In "w:spacing" value of "w:line" attribute value in table is not getting is preserved.

Conflicts:
	sw/qa/extras/ooxmlexport/ooxmlexport.cxx
Reviewed on:
	https://gerrit.libreoffice.org/6678

Change-Id: I2b0284a22da3a828c81876960f488049be4f8681