Updating the packages.conf in daemon mode does not reload it

[Peter Bindels]

Describe the bug
When editing packages.conf it is not taken into account for building

To Reproduce
Steps to reproduce the behavior:

1. Run Evoke in daemon mode
2. Edit packages.conf
3. See no change to errors, in any way
4. Edit some other file
5. Other file is reloaded, packages.conf is not

Expected behavior
Packages.conf reloaded & used

System (please complete the following information):

• OS: Ubuntu 18.04
• Compiler GCC
• Version 7.4
• Command line

Additional context
Daemon fork

[Peter Bindels]

Fixed in last commit. Also reloads when toolset changes.