Issue 2311: Adds support to decode metadata in the API that list ledgers

[fantapsody]

Descriptions of the changes in this PR:

Motivation

The current list ledgers API output the metadata in a serialized binary format, which is not friendly to human operators and external tools, and is not consistent with the output of the API that gets the metadata.

Changes

The PR adds a parameter called decode_meta, and output the ledger metadata in decoded format when the parameter presents and the value of it is 'true'.

Master Issue: #2311

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[eolivelli]

LGTM

But please add a test

[eolivelli]

LGTM
we have fixed the problem on Integration tests.
This patch is now good to go.

Let's wait for another binding +1 before merging the patch to master

[eolivelli]

can you please merge with current master?

[fantapsody]

can you please merge with current master?

The page shows that it has to be someone with write access can merge the PR...

[eolivelli]

Sorry
I meant to rebase this patch onto current master.
Two ways:
git checkout xxxxx
git fetch apache master

git merge apache/master
Or
git rebase apache/master

Assuming that xxxx is your branch and 'apache' is your git remote repository for main apache Bookkeeper repository

[fantapsody]

Sorry
I meant to rebase this patch onto current master.
Two ways:
git checkout xxxxx
git fetch apache master

git merge apache/master
Or
git rebase apache/master

Assuming that xxxx is your branch and 'apache' is your git remote repository for main apache Bookkeeper repository

Sure, I have rebased the PR, please take a look.

[eolivelli]

I have restarted integration tests