Phase2 pubnet limits and fees

[anupsdf]

What?

Ledger wide limits and write fees are changing in Phase 2.

Ledger limit change since phase 1:

"ledger_max_instructions": 500000000,
"ledger_max_read_ledger_entries": 200,
"ledger_max_read_bytes": 500000,
"ledger_max_write_ledger_entries": 125,
"ledger_max_write_bytes": 70000,

Write fee changes since phase 1:

          "bucket_list_target_size_bytes": 12500000000,
          "write_fee1_kb_bucket_list_low": -193153,
          "write_fee1_kb_bucket_list_high": 57695,

[sisuresh]

r+ ca712f0

[sisuresh]

r+ ca712f0

[sisuresh]

@latobarita: retry