* Moved shared memory read lock handling from tele2json.c to individual clients.

* Moved shared memory read lock handling from tele2json.c to individual clients.
* Fixed shared memory rwlock initialization to use appropriate set of attributes.
* Fixed not releasing the write lock when plugin initialization failed.
* Changed order of telemetry data initialization (e.g. raise alive flag only on success).
* Declared shared memory telemetry objects volatile in the clients.