[ghar] Use --accounts-per-client=10 param for land-blocking test
[ghar] Use --accounts-per-client=10 param for land-blocking test

Closes: #3189
Approved by: andll

aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra