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Don't try to set MTU on tunnel interface within (lib)openconnect itself

Daniel Lenski requested to merge no_MTU_setting_in_openconnect_itself into master

This has been the responsibility of the vpnc-script for a very long time, but the MTU-setting code was retained in openconnect for compatibility with ancient versions of the vpnc-script. The MTU-setting code causes noisy errors when running OpenConnect as non-root, and is simply redundant with all vpnc-scripts since at least 2009 (see vpnc-scripts@02b67455).

We will need to refine the MTU-setting code in the future (see #244 (comment 576191228)), but for now we should remove this code.

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