Geo: improve fuzz test.
Geo: improve fuzz test.

The test now uses more diverse radius sizes, especially sizes near or
greater the whole earth surface are used, that are known to trigger edge
cases. Moreover the PRNG seeding was probably resulting into the same
sequence tested over and over again, now seeding unsing the current unix
time in milliseconds.

Related to #3631.

xuguruogu/redis,pedigree/redis,4396/redis,4396/redis,4396/redis,pedigree/redis,xuguruogu/redis,xuguruogu/redis,xuguruogu/redis,pedigree/redis,pedigree/redis,4396/redis