detect if origin_site_name in DBS is SE or PNN and in case convert to PNN

[belforte]

see small discussion at https://github.com/dmwm/CRAB2/issues/927#issuecomment-51933468

[belforte]

Tony's instructions for the new API:

*\ Discussion title: Computing Operations

Hi,

as discussed in the meeting today I've extended the API:

• 'node', 'sename' and 'protocol' can be specified, in any combination.
• all three parameters may be omitted too, which gives you everything.
• no wildcards are supported, values are case-sensitive

• the return structure is a hash of (node,protocol,sename) triplets.

  Examples: wget --no-check-certificate -O - 'https://phedex-web-dev.cern.ch/phedex/datasvc/perl/prod/senames?sename=eoscms' wget --no-check-certificate -O - 'https://phedex-web-dev.cern.ch/phedex/datasvc/perl/prod/senames?sename=eoscms&node=T1_CH_CERN_MSS' wget --no-check-certificate -O - 'https://phedex-web-dev.cern.ch/phedex/datasvc/perl/prod/senames?sename=eoscms&node=T1_CH_CERN_MSS&protocol=rfio' wget --no-check-certificate -O - 'https://phedex-web-dev.cern.ch/phedex/datasvc/perl/prod/senames?node=T1_CH_CERN_MSS'

  Cases of non-matching arguments are handled in ways that now look a bit odd:

• a non-matching sename returns an empty array
• a non-matching node name returns 'undef' (or HTTP error 400, if the name is malformed, not just not-known)

• a non-matching protocol returns an array with one entry for that protocol, with the 'node' and 'sename' undefined (or HTTP error 400, if the protocol name is malformed)

  Examples: wget --no-check-certificate -O - 'https://phedex-web-dev.cern.ch/phedex/datasvc/perl/prod/senames?sename=no-such-sename' wget --no-check-certificate -O - 'https://phedex-web-dev.cern.ch/phedex/datasvc/perl/prod/senames?node=T3_NO_SUCH_NODE' wget --no-check-certificate -O - 'https://phedex-web-dev.cern.ch/phedex/datasvc/perl/prod/senames?protocol=nosuchprotocol'

  Suggestions on how to improve on that are welcome. Adopting the style for 'protocol=nosuchprotocol' for the other arguments, or their combinations, is one option, but if all three arguments are given that breaks down. An alternative is to return a triplet in which unset parameters are 'undef', and set-but-not-matched parameters are returned as 'unmatched', or something similar?

  Cheers, Tony.

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