clean-up/rename storageMonitor -> spaceMon

[kirg]

• Fixes multiple minor issues in the 'storageMonitor'
  • potential race enabling/disabling write (create/stoppage of channel)
  • new go-routine created every cycle
  • ticker not stopped
  • avoid logging when not in warn/alert condition
  • remove two-way dependency between storehost and spaceMon
  • minor annoyance: rename 'storagemonitor" to "spaceMon" to reduce file completion collision with "storehost.go" on 'stor< tab >' .. :-)

[coveralls]

Coverage decreased (-0.2%) to 66.31% when pulling 87269bc on spaceMon into 27bdb2b on master.

[coveralls]

Changes Unknown when pulling 10cf0d2 on spaceMon into ** on master**.

[coveralls]

Changes Unknown when pulling 2954dd3 on spaceMon into ** on master**.

[coveralls]

Changes Unknown when pulling 6b01dc9 on spaceMon into ** on master**.

[coveralls]

Changes Unknown when pulling c22fe7e on spaceMon into ** on master**.

[doodle-tnw]

@kirg Curious as to why do the thresholds need to be so high? Is this a uber use case or does cherami need the diskspace somehow?

[CLAassistant]

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