nethvoice: add proxy configuration for gateway and physical trunks

[Amygos]

• Add proxy in gateway and physical trunks configuration
• remove all provisioning functions, the configuration will be only uploaded manually

PRs:

• https://github.com/nethesis/nethvoice-wizard-restapi/pull/227
• https://github.com/nethesis/ns8-nethvoice/pull/142
• https://github.com/nethesis/nethvoice-wizard-ui/pull/190
• https://github.com/nethesis/nethvoice-wizard-ui/pull/194

[Stell0]

Implemented not tested:

Patton SmartNode

• [ ] 4112fxo
• [ ] 4112fxs
• [ ] 4114fxo
• [ ] 4114fxs_fxo
• [ ] 4114fxs
• [ ] 4116fxs4_fxo2
• [ ] 4118fxs_fxo
• [ ] 4118fxs
• [ ] 4526fxs
• [ ] 4552
• [ ] 4554
• [ ] 4638
• [ ] 4661fxs2_fxo2_isdn2
• [ ] 4661fxs4_fxo4_isdn4
• [ ] 4661fxs4_isdn2
• [ ] 4661fxs4_isdn4
• [ ] 4661fxs4_isdn8
• [ ] 4661
• [ ] 4671fxs8_isdn4
• [ ] 4970_4
• [ ] 4970

Patton Trinity

• [ ] TRI_ISDN_1
• [ ] TRI_ISDN_2
• [ ] TRI_ISDN_4
• [ ] TRI_PRI_1
• [ ] TRI_PRI_2
• [ ] TRI_PRI_4

Grandstream

• [x] gxw4216TLS
• [x] gxw4216
• [ ] gxw4224TLS
• [ ] gxw4224
• [ ] gxw4232TLS
• [ ] gxw4232
• [ ] gxw4248TLS
• [ ] gxw4248
• [ ] ht801TLS
• [ ] ht801
• [ ] ht802TLS
• [ ] ht802
• [ ] ht812TLS
• [ ] ht812
• [ ] ht814TLS
• [ ] ht814