Resolve nested placeholders via PropertyResolver
Prior to this change, PropertySourcesPropertyResolver (and therefore all AbstractEnvironment) implementations failed to resolve nested placeholders as in the following example: p1=v1 p2=v2 p3=${v1}:{$v2} Calls to PropertySource#getProperty for keys 'p1' and 'v1' would successfully return their respective values, but for 'p3' the return value would be the unresolved placeholders. This behavior is inconsistent with that of PropertyPlaceholderConfigurer. PropertySourcesPropertyResolver #getProperty variants now resolve any nested placeholders recursively, throwing IllegalArgumentException for any unresolvable placeholders (as is the default behavior for PropertyPlaceholderConfigurer). See SPR-9569 for an enhancement that will intoduce an 'ignoreUnresolvablePlaceholders' switch to make this behavior configurable. This commit also improves error output in PropertyPlaceholderHelper#parseStringValue by including the original string in which an unresolvable placeholder was found. Issue: SPR-9473, SPR-9569
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