Base: Add default tag manipulation

Allow the default tag (the program name) to be overwritten.

(cherry picked from commit 1923e768efeaf637bd368f93faa41ea45f542685)

Bug: 34867873
Test: m
Test: logging_test
Test: manual
Merged-In: I4ef32bad413a7cc82e46ce16a2f26212925964b1
Change-Id: I4ef32bad413a7cc82e46ce16a2f26212925964b1
3 files changed