LU-11607 tests: replace lustre_version/fstype in posix/perf

LU-11607 tests: replace lustre_version/fstype in posix/perf

The routine get_lustre_env() is available to all Lustre test
suites and sets environment variables for the Lustre
version and file system type for servers.

In posix, performance-sanity, and parallel-scale, replace
calls to lustre_version_code() and facet_fstype() for all
server types with definitions from get_lustre_env().

While doing this, replace "$SINGLEMDS" with "$MDS1_VERSION"
or "$mds1_FSTYPE" in lustre_version_code() and facet_fstype().

Clean up around any modifications by converting spaces to
tabs.

Test-Parameters: trivial testlist=posix,performance-sanity,parallel-scale
Test-Parameters: fstype=zfs testlist=posix,performance-sanity,parallel-scale
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: Id7d3c2a50c7b880c1147e9b6c721fddff07861fa
Reviewed-on: https://review.whamcloud.com/35934
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>