cms-sw/cms-git-tools#78: reimplement logging without referencing file descriptors

[cmsbuild]

A new Pull Request was created by @fwyzard (Andrea Bocci) for branch master.

Pull Request Reference: cms-sw/cms-git-tools#78

@smuzaffar, @iahmad-khan can you please review it and eventually sign? Thanks.

[cmsbuild]

Pull request cms-sw/cms-git-tools#78 was updated.
Latest update by Andrea Bocci with commit message
reimplement logging without referencing file descriptors

reimplenent the verbose and debug messages without referencing /dev/stdout or
/dev/stderr, which may be unavailable (e.g. running inside a container)

[cmsbuild]

Pull request cms-sw/cms-git-tools#78 was updated.
Latest update by Andrea Bocci with commit message
reimplement logging without referencing file descriptors

add a workaround for bash version 4.0 and older

[smuzaffar]

this should be now part of CMSSW_9_0_0_pre2
#2739