add function to push data from another cursor
Summary: Add a function to Writable to push data from another cursor. Data in the input cursor could be in a buffer chain. Added test in IOBufCurosTest.cpp to test the new function. Test Plan: fbmake runtests; Reviewed By: simpkins@fb.com Subscribers: njormrod, net-systems@ FB internal diff: D1563209 Tasks: 4886058 Blame Revision:
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