GetDefaultTmplFile checks the current working directory for *.nomad files.

GetDefaultVarFile checks the current working directory for levant.(yaml|yml|tf) files.

VariableMerge merges the passed file variables with the flag variabes to provide a single set of variables.

Flag is a flag.Value implementation for parsing user variables from the command-line in the format of '-var key=value'.

FlagStringSlice is a flag.Value implementation for parsing targets from the command line, e.g.