LU-11607 tests: replace version/fstype calls in replay-single

The routine get_lustre_env() is available to all Lustre test
suites and sets an environment variable for the file system
type for MDS1 and OST1 and sets a variable for the Lustre
version of servers.

In replay-single, replace the calls to facet_fstype() and
lustre_version_code() for all server types with definitions
in get_lustre_env().

While doing this, replace facet_fstype $SINGLEMDS and
lustre_version_code $SINGLEMDS with facet_fstype mds1
and lustre_version_code mds1, respectively.

Clean up around any modifications by removing calls to
return after skip() or skip_env().

Test-Parameters: trivial testlist=replay-single
Test-Parameters: fstype=zfs testlist=replay-single
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: I14d90f934401c9f0504d42adc9f6e59b12149b0b
Reviewed-on: https://review.whamcloud.com/35724
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>