Gns3-server

* Fix broken embedded console for Ethernet switch. Fixes 1574
* Remove old unused argument option. Fixes 1569

* Fix IOU symlink issue on remote servers.
* Fix vcpus configuration for GNS3 VM on VMware. Ref 2738.

* Fix issue when setting cpuid.corespersocket for the GNS3 VM. Fixes https://github.com/GNS3/gns3-gui/issues/2723
* Bump ACPI Shutdown Timeout to 120 seconds. Ref 1536

* Force jsonschema dependency to 2.6.0
* Less aggressive connections to uBridge. Ref 1289
* Fix topology images (Pictures) disappearing from projects. Fixes 1514.
* Reset MAC addresses when duplicating a project. Fixes 1522
* Fix API call to create a node from an appliance doesn't return the new node data. Fixes 1527
* Detect invalid environment variable and send a warning when creating a Docker node. Ref 2683
* Do not export/import symlinks for projects. Fixes 2699
* Fix symlink not being created for duplicated IOU devices. Fixes https://github.com/GNS3/gns3-gui/issues/2699
* Configure coresPerSocket value in VMX file for the GNS3 VM. Fixes https://github.com/GNS3/gns3-gui/issues/2688
* Count logical CPUs to detect if the number of vCPUs is too high when configuring the GNS3 VM. Fixes 2688.
* Add explicit error when trying to pull a Docker image from Docker Hub without Internet access. Fixes 1506.
* Fixes double display output in GRUB in QEMU v3.1. Fixes 1516.

* Tune how to get the size of SVG images. Ref https://github.com/GNS3/gns3-gui/issues/2674.
* Automatically create a symbolic link to the IOU image in the IOU working directory. Fixes 1484
* Fix link pause/filters only work for the first interface of Docker containers. Fixes 1482
* Telnet console resize support for Docker VM.
* Fix _fix_permissions() garbles permissions in Docker VM. Ref 1428
* Fix "None is not of type 'integer'" when opening project containing a Qemu VM. Fixes 2610.
* Only require Xtigervnc or Xvfb+x11vnc for Docker with vnc console. Ref 1438
* Support tigervnc in Docker VM. Ref 1438
* Update minimum VIX version requirements for VMware. Ref 1415.

* Catch some exceptions.