Make SearchHostRecordByAltId method more generic

[achernevskii]

In the IBObjectManager interface there's a SearchHostRecordByAltId method.

This method does combined searching, meaning:

1. First it tries to find HostRecord by ref.
2. If first step is failed, it tries to find HostRecord by EAs.

This method has the name specific to terraform provider, I think that we should make this method more generic by renaming it, and documenting it's params.

Related terraform provider discussion: infobloxopen/terraform-provider-infoblox#225 (comment)