Insert chatroom in DB only if its state is Created

Allow NULL particiant device joining time. This is required because the joining time is the time the device state switches to Present, therefore it is NULL when the device is added to the chatroom or conference

assigned to @KyronNextLevel

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• 7f2c46e7 - Updated linphone-sdk to master to check if mysql issue is fixed on Debian

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• 65554cc4 - Updated linphone-sdk to master to check if mysql issue is fixed on Debian

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• 3c0a7e63 - Updated linphone-sdk to release/5.2 to check if mysql issue is fixed on Debian

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