check 61451E - check for consecutive semicolons (jsc#TRNT-2015)

[angelabriel]

check using the new expect_enum
If we detect consecutive semicolons, we return critical.
If we detect less or more than 3 SBD devices, we return warning.
Everything else for now is passing.

[coveralls]

coverage: 95.045%. remained the same
when pulling 50e3391 on angelabriel:SBD
into 979919a on trento-project:main.

[dottorblaster]

@angelabriel is this fine to merge?

[angelabriel]

@dottorblaster yes, fine for me. Thanks for the review

[dottorblaster]

Great!