First set of log improvements

[rsafonseca]

• improve some logs
• fix nuid being incorrectly generated

[coveralls]

Pull Request Test Coverage Report for Build 6278486005

• 28 of 36 (77.78%) changed or added relevant lines in 4 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 61.733%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/remote.go	6	7	85.71%
session/session.go	10	12	83.33%
util/util.go	0	2	0.0%
agent/agent.go	12	15	80.0%

Files with Coverage Reduction	New Missed Lines	%
modules/binary.go	2	73.91%

Totals
Change from base Build 6278435147:	0.03%
Covered Lines:	4817
Relevant Lines:	7803

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💛 - Coveralls