Add netconf:base:1.0 capability to config_gen

The JNC Netconf client library doesn't support 1.1, so we need to
advertise support for the older protocol.

# Please enter the commit message for your changes. Lines starting
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# On branch enetconf-capabilities
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
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#	modified:   rel/files/sys.config
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
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#	.dir-locals.el
#	apps/linc_us4/linc_us4_flow_meck_original.coverdata
#	apps/linc_us4/linc_us4_groups_meck_original.coverdata
#	apps/linc_us4/linc_us4_port_meck_original.coverdata
#	apps/linc_us5/
#	scripts/sample.config
#	us5.diff
#	v5.diff