Replaced unrecommended backticks with $() in cql_version() in bash scripts.
*_execute() and *_execute_script() functions from src/bin/admin/admin-utils.sh now pass the parameters to the underlying backend binary whenever they are given rather than when there are 2 or more.
Corrected cql_version() return error in src/bin/admin/admin-utils.sh.
Removed redundant "USE" from cql_init() in src/bin/admin/kea-admin.in.
Inserted a newline in src/bin/admin/tests/Makefile.am to separate unrelated targets.
Style changes in cql_*_test() functions in src/bin/admin/tests/cql_tests.sh.in.
src/bin/admin/tests/dhcpdb_create_1.0.cql:
"perfromance" typo
Added comment headers
Added index on expire since it is used in WHERE clauses (further performance testing may be required)
Removed dhcp4_options and dhcp6_options table since they are not required for Cassandra
Added DROP INDEX in src/share/database/scripts/cql/dhcpdb_drop.cql.
Added sql_common.h
Added cql_exchange.h and cql_exchange.cc which mediate communication with Cassandra.
Added cql_lease_mgr.h and cql_lease_mgr.cc
Parameterized reconnect-wait-time, connect-timeout, request-timeout, tcp-keepalive, tcp-nodelay for Cassandra in kea.conf. Changes are in src/lib/dhcpsrv/cql_connection.cc and src/lib/dhcpsrv/parsers/dbaccess_parser.cc.
Reformated x != NULL into !x as specified in the Kea style guidelines
src/lib/dhcpsrv/cql_connection.cc:
Added range check for port
Added CqlConnection:setConsistency
Added CqlConnection::startTransaction which is a noop
Added CqlTransaction method implementations.
Corrected ending brace of namespace declaration, it doesn't need semicolon.
src/lib/dhcpsrv/cql_connection.h:
Added explicit on CqlConnection constructor. Unlikely that this class will ever be derived, but it's good practice.
Changed some comments.
Added CqlTransaction class definition.
src/lib/dhcpsrv/cql_lease_mgr.cc:
Formatted the entire code.
Changed data types to cass_ types.
Added some log messages.
Moved structs, enums and typedefs from src/lib/dhcpsrv/lease_mgr.h to src/lib/dhcpsrv/sql_common.h
Added some missing tests in src/lib/dhcpsrv/tests/cql_lease_mgr_unittest.cc
