Add phosphor-gevent recipe

And make it the default for Phosphor.

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: I531aa457bcc0fae4d4fff833fb1815a12af53edc
diff --git a/common/recipes-phosphor/interfaces/phosphor-rest.bb b/common/recipes-phosphor/interfaces/phosphor-rest.bb
index b03b245..a44258f 100644
--- a/common/recipes-phosphor/interfaces/phosphor-rest.bb
+++ b/common/recipes-phosphor/interfaces/phosphor-rest.bb
@@ -23,7 +23,7 @@
         "
 SRC_URI += "git://github.com/openbmc/phosphor-rest-server"
 
-SRCREV = "2c6fc760919cc214413874d60489e3643b639692"
+SRCREV = "7bc6d8d39daebe3529c4c31a8caa0288dfb0ecd5"
 
 S = "${WORKDIR}/git/module"
 SYSTEMD_SERVICE_${PN} = ""