'{MISSIONID}' and '{missionid}' tags are inconsistent in `safe_dir`

[oarcher]

In sentinelrequest, {missionid} and {MISSIONID} are inconsistent:

MISSIONID is like 'S1A', but missionid is '1a' (missing 's')

What we actually use on datarmor@ifremer is

/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-${missionid}

that returns

/home/datawork-cersat-public/cache/project/mpc-sentinel1/data/esa/sentinel-1a

I think that as {MISSIONID} is 'S1A', {missionid} should be 's1a', not '1a'.

'sentinel-1a' string should be a tag named like {longmission-id}

But to keep the existent working, we have to:

• deprecate {missionid} in favor of {longmissionid}
• few months after, same, but error raised
• few month after, {missionid} should be 's1a',

[oarcher]

note that {longmission-id} is an invalid string placeholder, it should be {longmissionid}

[oarcher]

commit 1bec3c7