Correctly filter target list for slavesHEADmaster

The list of slaves enabled for a target is a space-separated string. A
slave name can be a substring of another slave name, so matching it
using /\b${slave}\b/ is not accurate.

This is an issue when we have two slaves named "abc" and "abc-def"
and a target defined only for "abc". Currently, both slaves receive a
config including the target.

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