Add max sessions support per client config, REF 12409

Wenpeng Songrequested to merge
12409-max-session-client into asterisk_rdkb

Add and support max_sessions to the pjsip endpoint config, which reflect as VoiceService.{i}.SIP.Client.{i}.MaxSessions.

No actual behavior changes have been done, just followed the same behavior and add an extra condition check after max session per line as the line_calls count was calculated per endpoint.

Related MRs:
tr104!149 (merged)
https://dev.iopsys.eu/rdk-factory/provider/oem/askey/meta-rdk-askey/-/merge_requests/159

Edited by Wenpeng Song

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