[Bugs] [Bug 1707731] [Upgrade] Config files are not upgraded to new version

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1707731

Aravinda VK <avishwan at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|avishwan at redhat.com         |sacharya at redhat.com



--- Comment #1 from Aravinda VK <avishwan at redhat.com> ---
## Reading Old format:

Config file consists of a section named "__section_order__", read that to get
the order of different section. Sort the section based on order(based on
values), and prepare a dict with values updated from each section.

For example:

```
[__section_order__]
sec1=0
sec2=2
sec3=1

[sec1]
log_level = INFO

[sec2]
log_level = DEBUG

[sec3]
log_level = ERROR
```

configs = {}
for sec in sorded_sections():
    for item_key, item_value in sec.items:
        configs[item_key] = item_value

With this logic, `log_level` will have final value "DEBUG"


## Upgrade:

During Geo-rep start(In gsyncd.py):

- Read the session config and see it is a new format or old
- If it is old format, read the config as explained above
- Compare the configs collected and write to new config only if it is different
from Default configs
- Reload the new config

To get the old format config,

- Install old version of Glusterfs(<4) and create a geo-rep session.
- Set some configurations in Geo-rep
- Copy the config file for reference
- Old parsing code can be referred here
https://github.com/gluster/glusterfs/blob/release-3.13/geo-replication/syncdaemon/configinterface.py

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