[maven-release-plugin] copy for tag STRUTS_2_3_21
[maven-release-plugin] copy for tag STRUTS_2_3_20
[maven-release-plugin] copy for tag STRUTS_2_3_19
[maven-release-plugin] copy for tag STRUTS_2_3_16_3
[maven-release-plugin] copy for tag STRUTS_2_3_16_2
[maven-release-plugin] copy for tag STRUTS_2_3_17
[maven-release-plugin] copy for tag STRUTS_2_3_16_1