test: remove common.isOSXMojave
common.isOSXMojave was added because it was believed that there was a bug in macOS Mojave that allowed unprivileged users to bind to privileged ports. As it turns out, that was a feature not a bug. It is likely to be in all future versions of macOS. Remove isOSXMojave and skip appropriate tests based on isOSX.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines