[DMS] Rationalize the single/double slash in the storage plugins

[chaen]

Currently we have quite complicated and duplicated code to add or remove double slashes in the storage plugins.
For historical reasons, because SRM was the first, the default in DIRAC is actually against the URI RFC, and we have to do tricks to add the double slash for protocol that wants it.
In practice, most of them supports double and single slash, some are strict with double, and some are strict with single. Those strict with single are SRM (which is going to disappear) and Echo.
This should be factorized, and the default made such that we get a double slash, since the newer protocols insist on having it.

[fstagni]

Any target release for this? Any deadline?

[chaen]

hum, make it v7r2, since it should be transparent

[fstagni]

Is the above mentioned PR (which is merged) enough to close this issue?

[chaen]

nop :(

[chaen]

After digging more into it, won't fix. It's actually more work to fix it than to maintain it, especially that gfal2 does similar things under the hood.