Client runner: enabled oss cluster benchmarks for string (just set and get commands) benchmarks

[filipecosta90]

Benchmarks that we can now use on an OSS cluster deployment (It implied that we moved from --command to --ratio ) :

• memtier_benchmark-1Mkeys-load-string-with-100B-values-pipeline-10.yml
• memtier_benchmark-1Mkeys-load-string-with-100B-values.yml
• memtier_benchmark-1Mkeys-load-string-with-10B-values-pipeline-10.yml
• memtier_benchmark-1Mkeys-load-string-with-10B-values.yml
• memtier_benchmark-1Mkeys-load-string-with-1KiB-values.yml
• memtier_benchmark-1Mkeys-string-get-100B-pipeline-10.yml
• memtier_benchmark-1Mkeys-string-get-100B.yml
• memtier_benchmark-1Mkeys-string-get-10B-pipeline-10.yml
• memtier_benchmark-1Mkeys-string-get-10B.yml
• memtier_benchmark-1Mkeys-string-get-1KiB-pipeline-10.yml
• memtier_benchmark-1Mkeys-string-get-1KiB.yml

For the benchmarks that use --command on memtier we check for that keyword on the client arguments preparation and skip that benchmark when cluster-mode is enabled.

[slice4e]

approved