Removed unused DB-adapters, test cases, 60+% cover

We are not using OracleDB, PostgresDB, and VerticaDB, so there is no
need to keep the "dead code" -- we can always add it back as needed.
Added test cases so that all the files are at least minimally covered.
Overall coverage on my local tox shows 66% coverage (I manually ensured
all files are included in the coverage report).

Issue-ID: OPTFRA-95
Change-Id: If1cab112236b4f32a96315308ce815088fa092d1
Signed-off-by: Sastry Isukapalli <sastry@research.att.com>

1 files changed, 0 insertions, 31 deletions

diff --git a/osdf/adapters/database/PostgresDB.py b/osdf/adapters/database/PostgresDB.py
deleted file mode 100644
index 6689566..0000000
--- a/osdf/adapters/database/PostgresDB.py
+++ /dev/null
@@ -1,31 +0,0 @@
-# -------------------------------------------------------------------------
-#   Copyright (c) 2015-2017 AT&T Intellectual Property
-#
-#   Licensed under the Apache License, Version 2.0 (the "License");
-#   you may not use this file except in compliance with the License.
-#   You may obtain a copy of the License at
-#
-#       http://www.apache.org/licenses/LICENSE-2.0
-#
-#   Unless required by applicable law or agreed to in writing, software
-#   distributed under the License is distributed on an "AS IS" BASIS,
-#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#   See the License for the specific language governing permissions and
-#   limitations under the License.
-#
-# -------------------------------------------------------------------------
-#
-
-import psycopg2
-
-from osdf.utils.programming_utils import MetaSingleton
-
-
-class PostgresDB(metaclass=MetaSingleton):
-    conn, cur = None, None
-
-    def connect(self, host=None, db=None, user=None, passwd=None, port=5432):
-        if self.conn is None:
-            self.conn = psycopg2.connect(host=host, port=port, user=user, password=passwd, database=db)
-            self.cur = self.conn.cursor()
-        return self.conn, self.cur