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- Replace rand() with random()
- Use i++ rather than ++i

Tomek Mrugalski authored Mar 10, 2016 and Marcin Siodelski committed Mar 21, 2016

Also updated tests for Lease6::toText function.

This change was okayed on jabber by Thomas. The issue
occurred when static linking was enabled on OSX.

Linking a static lib from statically linked lib causes
various issues and isn't generally considered a good
idea.

- use unsigned int in for loops
- NULL pointer rather than NULL in function descriptions