Initial delivery of metrics code (#81)

* Initial delivery of metrics code

* Fix build issues

* Fix build issue with go vet

vendor/github.com/prometheus/common/config/testdata/barney-no-pass.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpQIBAAKCAQEAxmYjfBZhZbAup9uSULehoqPCv/U+77ETxUNyS2nviWEHDAb/
+pFS8Btx4oCQ1ECVSyxcUmXSlrvDjMY4sisOHvndNRlGi274M5a8Q5yD1BUqvxq3u
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+Z97rb0pstrjRtsLl/Cg68LWi9LEr0tHMIM4bgnkvb8qtfK+k7fZl0BSNrE2EqYvd
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+j0JMATRK8Qkj1zOE7/wL7dKBlCZaK3u+OT17spuA/21PG/cLiPaSGSA3CU/eqbkU
+BD6JeBxp33XNTytwWoOvarsigpL0dGqQ7+qhGq6t69qFfWoe9rimV7Ya+tB9zF/U
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+BU7QGpgcSR25CQ+Xg3QZEVHH7h1DgYLnPtwdQ4g8tj1mohTsp7hKvSWndRrdulrY
+zUyWmOeD3BN2/pTI9rW/nceNp49EPHsLo2O+2xelRlzMWB98ikqEtPM59gt1SSB6
+N3X6d3GR0fIe+d9PKEtK0Cs3AoGAZ9r8ReXSvm+ra5ON9Nx8znHMEAON2TpRnBi1
+uY7zgpO+QrGXUfqKrqVJEKbgym4SkribnuYm+fP32eid1McYKk6VV4ZAcMm/0MJv
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+eQly0Y0CgYEAnI6G9KFvXI+MLu5y2LPYAwsesDFzaWwyDl96ioQTA9hNSrjR33Vw
+xwpiEe0T/WKF8NQ0QWnrQDbTvuCvZUK37TVxscYWuItL6vnBrYqr4Ck0j1BcGwV5
+jT581A/Vw8JJiR/vfcxgmrFYqoUmkMKDmCN1oImfz09GtQ4jQ1rlxz8=
+-----END RSA PRIVATE KEY-----