Stop relying on Gerrit core for commons-io definition

Gerrit core stopped providing a definition for commons-io

  04807b67fc33d1a4abccb6172df534c3b34efc00

. As its-rtc is relying on commons-io, we need to provide it on our
own.

Change-Id: I67190a30ee84d30af78b3c7e6cf4bf6a5e063d70