[CBM] [TC] Versions are compared as strings

Problem

In tools-common, node versions are compared as strings (e.g. https://github.com/couchbase/tools-common/blob/5105de5e9963241b1e10710d52d4d9640b1ca323/couchbase/value/version.go#L87). This will break when server versions >10 are released e.g. when compared as strings "10.0.0" < "7.6.0". This will lead to the version checks not working.

This problem also affects backup indirectly, from using Older()/Newer()/AtLeast() e.g. https://github.com/couchbase/backup/blob/90b63165f36e815fd8f4c808f37c2f207cf374b3/archive/dir_repo.go#L611

Fix

Don't compare versions as strings. The easiest solution might be to modify the compare() method to parse out the ints separating the major/minor version and compare them properly as ints.