Logger default behaviour is not graceful

[amartyads]

Describe the bug
When not including a <loglevel> tag in an input xml, two things are seen in the output:

1. We get the error from Logger.h, because we pass info in Simulation.cpp and the check is case-sensitive
2. We get output from all ranks until it's set back to root somewhere inside this function call

To Reproduce
Steps to reproduce the behavior:

1. Create an xml file without the <loglevel> tag, and run
2. Check output

Expected behavior
Defaulting to INFO correctly, and regardless, output only being shown on root rank

Build environment (please complete the following information):

• OS: Linux
• Compiler: gcc, clang
• Build System: make

[HomesGH]

This issue was probably introduced with PR #359.
There is another open PR #373 related to the Logger. Maybe we could also fix this issue there, @cniethammer .