mongoose: git rm src/mongoose

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>

diff --git a/src/mongoose b/src/mongoose
deleted file mode 160000 (submodule)
index ca7d69f..0000000
--- a/src/mongoose
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit ca7d69fda0cd806b8b52debfa814b493d6dee3c1