refactored apis; added ability to skip optional plugins on error

rhel7_package_list.txt

-- make
-- autoconf
-- expect
-- gcc
-- g++
-- subversion
-- zlib-devel
-- openssl-devel
-- libffi-devel
-- openldap-devel
-- readline-devel
-- ncurses-devel
-- qt-x11
-- qt-postgresql
-- qt-devel
-- gtk2-devel
+RHEL7 Packages
+===============
+
+make
+autoconf
+expect
+gcc
+g++
+subversion
+zlib-devel
+openssl-devel
+libffi-devel
+openldap-devel
+readline-devel
+ncurses-devel
+qt-x11
+qt-postgresql
+qt-devel
+gtk2-devel
+
+Globus Packages
+===============
+
+globus-openssl-module
+globus-ftp-client
+globus-gsi-proxy
+globus-gsi-openssl
+globus-ftp-control
+globus-gass-copy
+globus-common-16.8
+globus-gass-transfer
+globus-io-11.8
+globus-gss-assist
+globus-gsi-cert
+globus-xio-popen
+globus-xio-gsi
+globus-gsi-credential
+globus-callout-3.15
+globus-gsi-sysconfig
+globus-gsi-callback
+globus-xio-5.14
+globus-gssapi-gsi
+globus-gass-copy
+globus-gsi-proxy
+globus-gssapi-error
+