add version files for 0.7.3*

versions/0.7.3

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+VERSION=0.7.3
+GLUON=6899e50c97b34976fcb7d627062e6effa8078067 # v2016.1.5
+BRANCH=stable
+SITE=977eb37cfba448fd4e11d4a855d7439c34e1de07 # 0.7.3
+TARGETS=ar71xx-generic ar71xx-nand mpc85xx-generic x86-generic x86-kvm_guest x86-64 x86-xen_domu
+TS=2016-07-20 14:16:15

versions/0.7.3~rc1

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+VERSION=0.7.3~rc1
+GLUON=6899e50c97b34976fcb7d627062e6effa8078067 # v2016.1.5
+BRANCH=testing
+SITE=7bb9945db0d1fdfb28a7cdee8516d87e581a2687 # 0.7.3~rc1
+TARGETS=ar71xx-generic ar71xx-nand mpc85xx-generic x86-generic x86-kvm_guest x86-64 x86-xen_domu
+TS=2016-07-07 12:25:01

versions/0.7.3~rc2

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+VERSION=0.7.3~rc2
+GLUON=6899e50c97b34976fcb7d627062e6effa8078067 # v2016.1.5
+BRANCH=testing
+SITE=be124364646ffeec110688815fea21b64e6d62b0 # 0.7.3~rc2
+TARGETS=ar71xx-generic ar71xx-nand mpc85xx-generic x86-generic x86-kvm_guest x86-64 x86-xen_domu
+TS=2016-07-18 20:19:13