DPL: fix for sending configuration with spaces

[aalkin]

Use a semicolon as a field separator for config parsing, this allows to send values with whitespaces (e.g. array labels).

[ktf]

@rbx here is another issue, this time notice it has nothing to do with DPL:

/mnt/mesos/sandbox/sandbox/o2-fullci/sw/slc8_x86-64/FairMQ/v1.4.29-1/lib/libFairMQ.so.1.4(_ZN5boost12interprocess9ipcdetail14semaphore_waitEP5sem_t+0xb)[0x7f8f6f8a7c7b]
/mnt/mesos/sandbox/sandbox/o2-fullci/sw/slc8_x86-64/FairMQ/v1.4.29-1/lib/libFairMQ.so.1.4(_ZN4fair2mq5shmem7ManagerC2ENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES8_mPKNS0_11ProgOptionsE+0x83d)[0x7f8f6f8def8d]
/mnt/mesos/sandbox/sandbox/o2-fullci/sw/slc8_x86-64/FairMQ/v1.4.29-1/lib/libFairMQ.so.1.4(_ZN4fair2mq5shmem16TransportFactoryC1ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPKNS0_11ProgOptionsE+0x93a)[0x7f8f6f8e1c2a]
/mnt/mesos/sandbox/sandbox/o2-fullci/sw/slc8_x86-64/FairMQ/v1.4.29-1/lib/libFairMQ.so.1.4(_ZN22FairMQTransportFactory22CreateTransportFactoryERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES7_PKN4fair2mq11ProgOptionsE+0x14c)[0x7f8f6f89f0bc]
/mnt/mesos/sandbox/sandbox/o2-fullci/sw/BUILD/c953ddccfc8835f26a1b69dac6c619b8fad7847e/O2/stage/tests/o2-test-memoryresources-MemoryResources[0x4107b4]

[ktf]

Wouldn't it be better to escape the spaces, rather than moving the problem to ";"?

[aalkin]

Wouldn't it be better to escape the spaces, rather than moving the problem to ";"?

We use our own parsing there, with an explicit check for the next separator symbol in the full string, escaping is simply ignored.

[ktf]

Ok. Now that the ws has landed we should probably switch to a proper serialisation method for the config.