pgAdmin 4 commit: Improvise the pgsql driver to keep the utility names

Improvise the pgsql driver to keep the utility names used for different
operation like backup, restore, etc within it.

Also:
* improvised the color combination of the background process logger.
* Removed an unnecessary print statement from the
  get_storage_directory(..) function, also return None if STORAGE_DIR
  is set to None.

Branch
------
master

Details
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http://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=b22d73ec463385af741118547c5ee5091d0ff3fa

Modified Files
--------------
web/pgadmin/browser/server_groups/servers/types.py  | 16 +++++++++++++---
web/pgadmin/misc/bgprocess/static/css/bgprocess.css | 13 +++++++------
web/pgadmin/utils/driver/psycopg2/__init__.py       | 16 ++++++++++++++++
web/pgadmin/utils/paths.py                          |  7 +++++--
4 files changed, 41 insertions(+), 11 deletions(-)