Enhance migration steps for deployed functions with secrets

Changelog for 0.14.1:

• PR #202 Fix for migration to 0.14.0 and #201 by @alexellis

Commits
195e81f Fix for #201 by @alexellis
06fbca8 Fix syntax error with error wrapping by @alexellis
e71d2c2 Update some errors to wrapped syntax by @alexellis
13f4a48 Correct error formatting by @alexellis
1341284 Rename getMounts to getOSMounts by @alexellis

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