We should not allow plugins to be deployable if they have invalid version strings (that is, does not follow the OSGi rules for version strings).

For example, if I already deployed a plugin with version "2.0.0" and I later deploy an updated plugin with version "ABC-6.0.0", that "ABC-6.0.0" version string is not valid OSGi version format and our code will assume 2.0.0 is after ABC-6.0.0 (see ComparableVersion class).

OSGi version syntax is:

version ::= major('.'minor('.'micro('.'qualifier)?)?)?
major ::= digit+
minor ::= digit+
micro ::= digit+
qualifier ::= (alpha|digit|'_'|'-')+
digit ::= [0..9]
alpha ::= [a..zA..Z]