Fix issue with CMAKE_MODULE_PATH

Closes #1942. Thanks to charlemagnelasse.

Closes #1956. Thanks to nduhme.

Closes #1960. Thanks to twegener-embertec.

This occured if a successful connection was not made.

Closes #1957. Thanks to Peoh.

Systemd service changes for updated pid path

Signed-off-by: Peter Stevenson <pete@ihut.co.uk>

The code would simply append the folder with no separator, resulting in an invalid path if the variable was not empty.
Now properly append it.

Signed-off-by: Pierre Hallot <hallotpierre@gmail.com>

https://cmake.org/cmake/help/latest/command/cmake_minimum_required.html


"Note Call the cmake_minimum_required() command at the beginning of the top-level CMakeLists.txt file even before calling the project() command. It is important to establish version and policy settings before invoking other commands whose behavior they may affect."

Signed-off-by: Pierre Hallot <hallotpierre@gmail.com>

According to this from the mailing list, it is no longer required since the minimum cmake required is 3.0.

https://cmake.org/pipermail/cmake/2014-July/058048.html


"The code that emits the warning is run by "project()". Since you do not have an explicit project() call in your top-level CMakeLists.txt CMake adds one to the top implicitly. [1]
A project file that explicitly calls project() after requiring CMake >= 2.8.4 should make the warning go away."

Signed-off-by: Pierre Hallot <hallotpierre@gmail.com>

This was not happening for the case when the existing session wasn't
being continued.

Closes #1946. Thanks to Rory Piper.

Closes #1945. Thanks to Andreas Schildbach.

Only applies if if `-c` is not also used.

Closes #1949. Thanks to J. Augusto de Oliveira.

Closes #1947. Thanks to Patrick TJ McPhee.

Closes #1938. Thanks to apple3306 and JulianCaruso.

Closes #1936. Thanks to sectokia.

Closes #1939. Thanks to Frank Tegtmeyer.

This meant ciphers using DHE couldn't be used.

Closes #1925. Closes #1476. Thanks to Jonathan Sönnerup, Valerii
Demeshko, and sectokia.

This meant ciphers using DHE couldn't be used.

Closes #1925. Closes #1476. Thanks to Jonathan Sönnerup, Valerii
Demeshko, and sectokia.

Closes #1934. Thanks to sectokia.

apps: mosquitto_ctrl: don't hard set paths