Add the ability to provide extra command line arguments to hostapd and netremote-server

[abeltrano]

Type

• Bug fix
• Feature addition
• Feature update
• Documentation
• Build Infrastructure

Side Effects

• Breaking change
• Non-functional change

Goals

• Allow specifying extra command line arguments to hostapd and netremote-server binaries.

Technical Details

• Append environment variables HOSTAPD_XTRA_ARGS and NETREMOTE_SERVER_XTRA_ARGS to the ExecStart directives in each of the corresponding unit files, allowing additional arguments to be specified to their command line.
• Add the online network target as dependency of netremote-server unit to ensure networking comes online before the service is started.

Test Results

• systemctl edit hostapd@wlan0 and added the following line to override.conf drop-in:

[Service]
HOSTAPD_XTRA_ARGS="-ddddd"

Then systemctl restart hostapd@wlan0 and validated that verbose debug output was available in journalctl output for the unit.

Reviewer Focus

• None

Future Work

• None

Checklist

• Build target all compiles cleanly.
• clang-format and clang-tidy deltas produced no new output.
• Newly added functions include doxygen-style comment block.