mongoreplay does not exist in mongodb-org official repository for Linux distributions, I tried to find out exact time that it is removed, but I couldn't, I traced it up to version 3.2.9 in the apt repo, none of -tools packages have it
And also taking a look at this in packager.py:
# Remove the mongoreplay binary due to libpcap dynamic
if os.path.exists(sdir + "bin/mongoreplay"):
os.unlink(sdir + "bin/mongoreplay")
It is wired for a team to develop a program and then not ship that with this weird if! (If it is our work there, delete it!)
I think libpcap can be simply a dependency for mongoreplay package, libpcap is available under any distro I checked!