add indexes to domains and certificates tables to optimize load time

lemur/migrations/versions/c87cb989af04_.py

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+"""Create an index on the domains table for the domain name
+Revision ID: c87cb989af04
+Revises: 9392b9f9a805
+Create Date: 2018-10-11 09:44:57.099854
+
+"""
+
+revision = 'c87cb989af04'
+down_revision = '9392b9f9a805'
+
+from alembic import op
+
+
+def upgrade():
+    op.create_index(op.f('ix_domains_name'), 'domains', ['name'], unique=False)
+
+
+def downgrade():
+    op.drop_index(op.f('ix_domains_name'), table_name='domains')

lemur/migrations/versions/f2383bf08fbc_.py

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+"""Create index on certificates table for id desc
+
+
+Revision ID: f2383bf08fbc
+Revises: c87cb989af04
+Create Date: 2018-10-11 11:23:31.195471
+
+"""
+
+revision = 'f2383bf08fbc'
+down_revision = 'c87cb989af04'
+
+import sqlalchemy as sa
+from alembic import op
+
+
+def upgrade():
+    op.create_index('ix_certificates_id_desc', 'certificates', [sa.text('id DESC')], unique=True,
+                    postgresql_using='btree')
+
+
+def downgrade():
+    op.drop_index('ix_certificates_id_desc', table_name='certificates')