bank*: distribute initial balances uniformly

[Totktonada]

Before this commit the initial distribution was the following: first
account has total-amount balances, other 9 ones have zero balance.

From time to time is appears that there are no attempts to transfer from
the first account. It means that all transfers are marked as failed and
the history analysis reports fail.

Even when there are some successful transfers, there are many attempts
to transfer from an account with zero balance: those transfers are
useless in terms of tarantool testing.

This commit changes the initial distribution to the uniform one and
resolves the problems, which are described above. See the linked issue
for details.

Aside of the problematic bank-lua I changed other banking tests in the
same way to unify the approach. How each test is changed:

• bank-lua: [100 0 0 0 0 0 0 0 0 0] -> [10 10 10 10 10 10 10 10 10 10].
• bank-multitable-lua: the test already distributes initial balances
  uniformly, but hardcodes balance value. Now it is deduced from the
  total-amount parameter.
• bank: same as bank-lua.
• bank-multitable: same as bank-lua.

'bank' and 'bank-multitable' fixes are blind, because they're disabled.
See #83.

'bank-lua' and 'bank-multitable-lua' are passed in a manual run.
'bank-lua' gives 2-3 failed transfers of ~40 ones. Before it was like
5-15 successful ones of 30-40. (I have no representative statistics,
just looked over several runs in CI, but the numbers looks expected.)

Fixes #94

[Totktonada]

@ligurio Please, look if time permits. My reason to fix it is just because I don't want to see those periodical fails.

I tested it manually using CI. The results are here (those logs will be expired after some time). However I tried cluster testing as well and persisted logs and artifacts in #98. Don't be confused by another commit hash: the code is the same, I just updated the commit message.

[ligurio]

Thanks! I like your idea to distribute balances uniformly.

[Totktonada]

Re-verified after review fixes: results.

[Totktonada]

Re-verified after review fixes: results.