Make wpa-controller tests deterministic

[abeltrano]

Type

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

Side Effects

• Breaking change
• Non-functional change

Goals

• Eliminate the obnoxious requirement to run the wpa-controller-test-unit unit tests from the CMake binary directory root.
• Fix the bug where all wpa-controller-test-unit tests would fail if the control socket directory doesn't exist.

Technical Details

• Remove hostapd.conf.format.hxx.in configure file, relocating its contents to a detail namespace in WpaDaemonManager.cxx. This became possible since the control socket path is no longer directly written to the file at compile time, but at runtime using the previously compile-time initialized ProtocolWpa::ControlSocketPath* members.
• Add helper function to obtain compile-time set control socket paths for hostapd and wpa_supplicant.
• Add format string for default wpa_supplicant configuration file.
• Add control socket path as argument for writing default WPA daemon configuration file.
• Add HostapdBinaryInfo.hxx.in configure file which is populated with variables describing the hostapd binary directory and daemon executable.
• Ensure the control socket directory exists before starting the WPA daemon (it's not created if it doesn't exist).

Test Results

• All unit tests pass.
• Ran the wpa-controll-test-unit tests from root of source tree (not binary tree) and verified it worked and all tests passed.

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.