Remove snapshot submodule.

Note that for existing checkouts, a copy remains in $GIT_DIR/modules so
checkout of previous revisions does not require fetching from a remote
repository.  New checkouts will not have a copy unless an older revision
is checked out, followed by git submodule update --init --recursive.

.gitmodules

@@ -6,9 +6,6 @@
 	path = libraries/appbase
 	url = https://github.com/eosio/appbase
         ignore = dirty
-[submodule "programs/snapshot"]
-	path = programs/snapshot
-	url = https://github.com/EOSIO/genesis.git
 [submodule "contracts/musl/upstream"]
 	path = contracts/musl/upstream
 	url = https://github.com/EOSIO/musl.git

snapshot @ e2a2e74e

-Subproject commit e2a2e74e456413f5d6e6439d4918d1b417ede1c3